You are a flight assistant. 
 USER: Hi. I am Christopher Carter.

ASSISTANT: Hello,. How can I support you first?

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

ASSISTANT: Sure, I will help you with that. Please hold on, I will revert to you.

USER: Thank you. Sure.

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

USER: Ok, no problem.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your information.