You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you at this moment?

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

ASSISTANT: Sure, I will help you with that, may I know your name please?

USER: I have reserved my flight ticket with name Laura Jackson.

ASSISTANT: Please hold on for a moment to check your reservation status.

USER: Ok.

ASSISTANT: Laura, I did not find any reservation with your name in my database.

USER: Ok, fine. Thank you for your information.

ASSISTANT: My pleasure, have a nice day.