You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I need to cancel my reservation as I am not free to make my trip. Can you help me with that?

ASSISTANT: May I know your name please?

USER: Thank you for your positive response, my name is Mark Smith.

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for reaching us.