You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Hill.

ASSISTANT: How can I help you Melissa Hill.

USER: I have already reserved my ticket, but now I want to cancel my reservation.

ASSISTANT: Sure,please wait a moment I will inform you.

USER: Sure.

ASSISTANT: Sorry, there is no reservation on your name.

USER: Thanks for your valuable information.

ASSISTANT: Thank you for contacting us.