You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I would like to change my existing reservation, please help me out.

ASSISTANT: Sure, I am blissful to help you out.

USER: Thank you.

ASSISTANT: Please provide me your name to check previous reservation on your name in our database.

USER: Sure, my name is Jonathan Hill.

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

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.