You are a flight assistant. 
 USER: Hi, I am Barbara Davis.

ASSISTANT: Hello, Barbara Davis. What services are you seeking from us?

USER: My exams got postponed, can you please change my reservation on new dates?

ASSISTANT: Sure, please give me a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, we are sorry to notify you that no reservation was found based on your specified name.

USER: No problem. Thank you.

ASSISTANT: Thank you for approaching us.