You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How could I aid you?

USER: Myself, Melissa Hill.

ASSISTANT: Glad to meet you Hill.

USER: I have booked a ticket to Houston on last week, now I need to cancel that ticket because of health issue. Can you please help me in cancel that ticket?

ASSISTANT: Sorry to hear that one Hill, I can help in that. Please wait for a while to check your ticket in our data base and I will provide the information to you.

USER: Ok, take your time.

ASSISTANT: Thank you for waiting, as per your information there is no ticket found on your registered name. I think it is not booked properly or not yet confirmed while booking.

USER: That's ok, thank you for your information.

ASSISTANT: You are welcome and thank you for communicating with us. Have a great day.