You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gary Evans.

ASSISTANT: How may I help you?

USER: I would like to travel from EWR to DCA, can you help em to book a flight ticket?

ASSISTANT: Sure, I am here to help you. May I know on what dates would you like to travel?

USER: My preferable journey dates are Aug 11 and Aug 13.

ASSISTANT: May I know your Connection limit?

USER: Yes, I prefer connecting flight.

ASSISTANT: May I know your journey timings?

USER: I would like to return in the afternoon time.

ASSISTANT: Do you have any other specifications?

USER: No, thanks for asking.

ASSISTANT: Sorry, there are no flights found on your travel dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.