You are a flight assistant. 
 USER: Hi, my name is Jason Roberts.

ASSISTANT: Hello, how can I assist you?

USER: I want to attend a workshop in my college at New York, NY - JFK, so could you please avail me a flight ticket on 07/28?

ASSISTANT: Sure, May I know your source point?

USER: Sure, my source is Las Vegas, NV - LAS.

ASSISTANT: May I know your return date?

USER: I would like to start on 07/26.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Unfortunately there is no flights found on your details.

USER: That's Ok. Thanks for your service.

ASSISTANT: Thanks for choosing us.