You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: Can you help me in changing my existing reservation?

ASSISTANT: Surely, I will help you out. Can I have your name please?

USER: I am Sharon Martinez.

ASSISTANT: Thanks for your name, please standby.

USER: Sure.

ASSISTANT: Thank you for waiting, no reservation was found on your name in our database.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.