You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: My examination scheduled dates has been postponed.So, I would like to change my recent reservation which is under my name. Can you please help me with that?

ASSISTANT: Yes, sure I am happy to help you. Can I know your name to check is there any reservation on your name?

USER: Sure, I'm Sharon Lopez.

ASSISTANT: Right now there is no reservation done before on your name in our database.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: You are welcome.