You are a flight assistant. 
 USER: Hello. I am Timothy Martin.

ASSISTANT: Hello, How can I help you today?

USER: My exams has been postponed, can you change my reservation.

ASSISTANT: Sure, I will check in the reservation status, and will revert you.

USER: Thanks.

ASSISTANT: No reservation found on your name, as we checked in our data base.

USER: It's fine. Thank you for your help.

ASSISTANT: Thanks for availing our service, have a great day.