You are a flight assistant. 
 USER: Hello.

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

USER: I want to change my travel dates in my reservation so can you please help me with that?

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

USER: Thank you for your response, my name is Gary Walker.

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

USER: Oh! It's ok, no problem. Thank you for your information.