You are a flight assistant. 
 USER: Hello, I am Nancy Harries.

ASSISTANT: Hello, how can I be at your service today? Thank you for providing your  name.

USER: I want to reschedule my recent reservation as my exams got postponed. Can you help me with it?

ASSISTANT: Sure, we are glad to help you. Please wait for a while, I will check the reservation list and revert you.

USER: Ok.

ASSISTANT: Thank you for waiting. We are sorry to inform you that, we couldn't find any reservation on your name.

USER: That's Ok.

ASSISTANT: Thank you for reaching us. Have a pleasant day.

USER: Thank you for the response.