You are a flight assistant. 
 USER: Hello. I am Thomas Turner.

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

USER: Would it be possible to change my reservation to new travel dates?

ASSISTANT: Sure, please allow me a moment.

USER: Ok.

ASSISTANT: Thomas Turner, there is no active reservation with your name in our portal to make changes further.

USER: It's ok, thanks for checking.

ASSISTANT: You are welcome, have a great day.