You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Baker.

ASSISTANT: How can I assist you at this moment?

USER: I would like to change my reservation which is under my name. Can you please help me with that?

ASSISTANT: Sure Baker, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Sure, take your time.

ASSISTANT: Sorry Charles Baker, no reservation has found under your name to change.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for choosing us, have a good day.

USER: You are welcome.