You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I want to change an existing reservation, can you please help me in that?

ASSISTANT: Sure, I am here to help you out. Please provide me your name to check the reservation.

USER: My name is Laura Lee.

ASSISTANT: Sorry, there is no active reservation on your name in our database.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Laura Lee, thank you for reaching us.