You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my recent reservation as my exam dates has been preponed, help me in changing my reservation.

ASSISTANT: Sure, may I know your name please?

USER: I am Sharon Jones.

ASSISTANT: Ok, please wait for a moment, I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: Its ok, thank you.

ASSISTANT: Thank you for opting us.