A secret admirer

Matt opened his mail, and he came upon a strange unmarked letter. Its paper was crisp and generic. Not sensing anything odd from it, he confidently opened the envelope. There was a soft pop and out flew a spirit. It was a male imp, flying mid-air. It was dressed cordially, in a tiny butlers outfit.
"Good evening Master Summoner. " the imp spoke in an impeccable british accent "My Lady has taken note of you, and has graciously extended an" he paused here intentionally, choosing his words for effect " invitation" he paused again, staring Matt in the eyes to drive the non-optional aspect further, " to dinner. A public venue, but a private room. Do you find this agreeable?"

Internally Matt was reeling, theres another person who could use magic like him in this world. And she had just gone a lengths to arrange a meeting with him. He had ****, he had to meet this woman. Maybe she could tell him more about the nature of spirits... Matt's mind continued to reel.
Externally, Matt's practiced graces kicked in. "Yes, I find a meeting of the minds most agreeable in fact. What is your grace's name may I ask?" Matt's eyes glanced at Tar, who was normally would apply her magic here, but she just shrugged, seems her magic is no good on other spirits.
The imp let out a single chortle, and replied "Excellent, my master asks to go by The Witch of the Tempest, but you may call her by her less formal title of Magus or Mage." He paused here, gauging Matt's reaction, which was moderately bewildered, which seemed to please the servile imp. He continued, "The date is set to this Friday at One Piano at 8, be there at 7:45, and do dress better than... that." condescendingly pointing at Matt's pajamas.
"I thank you for your time. Farewell." The imp said before turning into green flames.

The room was silent for a few moments. "Well it looks like you have a date big boy, lucky you." Tar said, reverting to her larger form and giving Matt a kiss on the cheek before leaving the room.