You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Can you please help me to change the trip dates in the existing reservation? Because I have postponed my trip due to some work.

ASSISTANT: Sure, we are here to help you.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name please?

USER: My name is Joshua Green.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I can wait for your response.

ASSISTANT: Thank you for waiting, sorry we could not find any reservation on your name.

USER: It's ok, not a problem with that. Thank you for checking my ticket status.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.