You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out?

ASSISTANT: Sure, could I have your name please?

USER: Sure, my name is Amy Roberts.

ASSISTANT: Ok, please allow me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation with your name in our portal to make changes.

USER: That's ok, no issue. Anyway thank you for your information.

ASSISTANT: You are welcome, have a great day.