You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am David Young.

ASSISTANT: How may I help you?

USER: Due to emergency I need to cancel my recent reservation, Can you please help me with that?

ASSISTANT: Nice to meet you David.

USER: Ok.

ASSISTANT: Sure, I will help you in flight ticket cancellation. Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for your time. There is no flight reservation on your name to cancel it.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thanks for your information.