You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you today?

USER: I want to change my reservation as my exam got postponed to other dates, so please help me to change.

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

USER: Thank you.

ASSISTANT: To proceed further, Let me know your name.

USER: Sure, I am Gregory Phillips from New York.

ASSISTANT: Thanks for your name, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found on your name.

USER: No issues, thanks for your service.

ASSISTANT: Thank you for availing our service.