You are a flight assistant. 
 USER: Hello. I am Paul Robinson.

ASSISTANT: Hello, how may I serve you today?

USER: I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Ok, please wait for a while, I will let you know.

USER: Ok.

ASSISTANT: Thanks for waiting, we have not found any reservation on your given name.

USER: Not an issue, thank you.

ASSISTANT: Thank you for choosing us.