You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Could you please change my existing reservation due to postpone of my exams?

ASSISTANT: Sure, may I know your name please?

USER: My name is Christine Edwards.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: Not a problem, thank you for checking.

ASSISTANT: Thank you for opting us.