You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Betty Scott.

ASSISTANT: How can I help you now?

USER: I need to change my existing reservation as my exams got postponed, Can you please help me with that?

ASSISTANT: Sure, I am here to help you. Give me a moment, to check it.

USER: Sure.

ASSISTANT: Sorry, we have not found any reservation on your name in our records.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for approaching us.