You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: I need to change my existing reservation as my examinations got postponed. Can you help me with it?

ASSISTANT: Sure, we are here to help you to change it. May I know your name?

USER: My name is Barbara Jones.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

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

USER: Thank you.

ASSISTANT: Thank you for opting us.