You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Myself Betty Evans, I want to attend a business conference meeting at New York. Can you please help me in booking the ticket from DCA to LGA?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: I am willing to travel on 05/20 and again I will return back on 05/22.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: Not a big deal, anyway thank you very much for your service.

ASSISTANT: Thank you for consulting us, have a great day.