You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Joseph Taylor, want to cancel my recent reservation due to some emergency. Please help me out with that.

ASSISTANT: Sure, I will help you. Sorry, there is no reservation found under your name.

USER: That's ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your help.