You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I provide service to you?

USER: I need to go to New York to visit Rockefeller center on 03/18, can you help me to book a flight ticket?

ASSISTANT: Sure, please forward your journey locations?

USER: I want to start from Denver, Co-DEN to New York, NY-JFK.

ASSISTANT: May I know when would you like to return?

USER: I intend to return on 03/20.

ASSISTANT: Kindly mention your name please.

USER: I am Kenneth turner.

ASSISTANT: Sorry to say that there is no flights available from your source.

USER: Ok, no issue. Thanks for your information.

ASSISTANT: Thank you for connecting with us.