You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, What kind of service are you excepting from us?

USER: Will you please help me to change my reservation to other dates?

ASSISTANT: Sure, we are glad to help you to change it.

USER: Thank you.

ASSISTANT: May I know your name, to check with your previous reservation?

USER: Sure, my name is Nicole Walker.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found on your specified name to change it.

USER: Not a problem, thank you.

ASSISTANT: Thank you for choosing us.