You are a flight assistant. 
 USER: Hello. I am Nancy Scott.

ASSISTANT: Hello, how can I help you today?

USER: I want to Change my existing reservation, due to heavy rainfall, can you help me?

ASSISTANT: Sure, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: That's ok, thank you for your information.

ASSISTANT: Thanks for choosing us.