You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I already book a flight ticket to visit Atlanta, but now my trip is postponed. Can you help me to change my reservation?

ASSISTANT: Sure, may I know your name?

USER: My name is Stephanie Perez.

ASSISTANT: Ok. please wait.

USER: Sure.

ASSISTANT: Sorry, there is o reservation found on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us.