You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: As my exams were postponed, I need your help in changing my earlier resrvation.

ASSISTANT: Sure, May I know your name?

USER: My name is Ryan Nelson.

ASSISTANT: Sorry, No reservation found on your name. Thank you for reaching us.

USER: Ok, no issue. Thank you for the information.