You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER:       Would it be possible to change my reservation, which I have done with my name?

ASSISTANT: Sure, May I know your name?

USER: Yes, my name is Andrew Lewis.

ASSISTANT: Please wait a second.

USER: Take your time.

ASSISTANT: Sorry, No reservation found on your name.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for opting us.