You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know who is this?

USER: I'm Nancy Johnson.

ASSISTANT: How can I assist you?

USER: Due to a sudden meeting, I want to cancel my reservation. Would you help me out?

ASSISTANT: Sure, I will help you. But Nancy Johnson there are no flights on your name.

USER: That's great.

ASSISTANT: Thank you for reaching us.

USER: Thank you for helping me.

ASSISTANT: Have a great day a head.