You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I would like to change my reservation as I am leaving for business meet, can you please help me out?

ASSISTANT: Sure, We are here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Christopher Williams here.

ASSISTANT: Give me a minute.

USER: Sure.

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

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for approaching us.