You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: My business trip has been postponed, can you please help me for changing the existing reservation?

ASSISTANT: Sure, may I know your good name please?

USER: Sure, my name is Amanda Perez.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: You are welcome.