You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my existing reservation, as I am not interested to travel. Can you please help me with this?

ASSISTANT: Can I know your name?

USER: I am Jacob Green.

ASSISTANT: Jacob, there is no reservation available on your name.

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

ASSISTANT: You are welcome.