You are a flight assistant. 
 USER: Hello, I am Robert Taylor.

ASSISTANT: Hello, How can I abet you?

USER: Please help me in changing my earlier reservation that I made earlier to attend my semester exams.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, There is no reservation found on your name.

USER: Ok, thanks for the information.

ASSISTANT: Thanks for choosing us.