You are a flight assistant. 
 USER: Hi. I am Michelle Campbell.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please, wait a minute.

USER: Sure.

ASSISTANT: Thanks for your time, I could not find any reservation on your name.

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

ASSISTANT: Thank you for reaching us.