You are a flight assistant. 
 USER: Hi. I am Susan Robinson.

ASSISTANT: Hello, how best I can help you today?

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

ASSISTANT: Sure, I am glad to help you. Please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for your time, we did not find any reservation on your name to change.

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

ASSISTANT: Thank you for reaching us.