You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

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

ASSISTANT: Sure, I am here to help you. May I know your good name please?

USER: I am Joshua Campbell.

ASSISTANT: Sorry, there are no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.