You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me to change the flight ticket which I have done last week to visit the water world but due to the bad weather condition, I can not travel?

ASSISTANT: Sure, may I know your name?

USER: Sure, my name is Betty Hill.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for choosing us.