You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I want to cancel my reservation which is done recently due to some problems, can you please help me out?

ASSISTANT: Ok, please share your name?

USER: Sure, my name is Dennis Carter.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, that's fine. Thank you for your service.

ASSISTANT: Thank you.