You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight ticket from EWR to DCA. Could you help me in booking?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My travelling dates are from July 30 - Aug 01.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Would you like to travel in a direct flight or a connecting flight?

USER: I prefer for connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your good name please?

USER: Ryan Williams here.

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

USER: That's ok, no problem. Thank you.

ASSISTANT: You are welcome.