You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I help you today?

USER: I am Amanda Robinson. Please, change my existing reservation as my semester exams got postponed.

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: Ok, thank you for information.

ASSISTANT: Thanks for opting us.