You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Charles Allen.

ASSISTANT: Yes, Allen.

USER: I would like to cancel my recent reservation, can you please help me?

ASSISTANT: Sure, I can help you with that. Please be on hold.

USER: Ok, take your own time.

ASSISTANT: Charles, there is no reservation found under your name to do cancellation.

USER: that's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.