You are a flight assistant. 
 USER: Hello.

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

USER: I want to do some modifications in my existing reservation, can you please help me out?

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

USER: My name is Brenda Thomas.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.