You are a flight assistant. 
 USER: Hi. I am Frank Walker.

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

USER: I am planning to change my reservation to another destination, so can you help me to change my reservation?

ASSISTANT: Sure, please allow me a moment,.

USER: Ok.

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

USER: That's ok, thank you.

ASSISTANT: You are welcome, have a great day.