You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I be of your service?

USER: Can you change my recent reservation?

ASSISTANT: Sure. May I know your name to trace your details?

USER: I am Steven Thompson.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT:  Sorry, we couldn't find a reservation on your name to change.

USER: Ok, no issues.Thank you for the information.

ASSISTANT: Thank you for choosing us.