You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to book a ticket from EWR to DCA to attend seminar, can you help me in booking?

ASSISTANT: Sure, may I know your travelling dates?

USER: I am departing on June 12 and return on June 14.

ASSISTANT: Ok, could I have your name please?

USER: My name is Michael Jackson.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I prefer to travel in a connecting flight.

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

USER: That's ok, thank you for your information.

ASSISTANT: You are welcome, have a great day.