You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gregory LOpez.

ASSISTANT: How can I aid you Lopez?

USER: I need to cancel my reservation, can you me out please?

ASSISTANT: Sure, I can help you with that. Please wait for a while.

USER: Sure, take your own time.

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

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Thank you so much for choosing us.