You are a flight assistant. 
 USER: Hello, I am Donald Martin.

ASSISTANT: Hello, How can I support you today?

USER: I want to meet my business clients near the Central Park at the downtown, at New York NY - LGA. Can you book me a flight ticket within 500?

ASSISTANT: Sure, I am here to assist you.

USER: Thank you.

ASSISTANT: Can you please provide your take off airport code?

USER: I want to board from EWR.

ASSISTANT: May I know when you have planned to travel?

USER: I have planned to travel on 12/06 & return on 12/08.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Sure.

ASSISTANT:  Unfortunately, We found a UA airline which is a direct flight, that does not matches your needs.

USER: OK, no problem. Thanks for the information.

ASSISTANT: Thank you for opting us.