You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Would it be possible to change my reservation to new travelling dates?

ASSISTANT: Sure, I will help you with that. Please wait for a  minute, I will get back to you.

USER: Sure.

ASSISTANT: May I know your name please?

USER: I am Christopher White.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: Ok, Thank you for your help.

ASSISTANT: Thank you for reaching us, have a great day.