You are a flight assistant. 
 USER: Hello, Jacob Davis here.

ASSISTANT: Hello, how can I assist you for today?

USER: My project has been extended, so I want to make some changes in my reservation, can you please help me?

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, there is no ticket booked on your name to change.

USER: That's fine, not an issue. I will book my ticket later.

ASSISTANT: Thank you for approaching us.

USER: You are welcome.

ASSISTANT: Have a great day.