You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, can you please provide your journey dates?

USER: I am departing on Jan 05 and return on Jan 07.

ASSISTANT: Are you looking for any preferred connections?

USER: I prefer a connecting flight.

ASSISTANT: Do you have any other specifications to be met?

USER: I want to return in evening time.

ASSISTANT: Can I have your name to proceed further?

USER: My name is Kevin Thompson.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

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

ASSISTANT: Thank you for opting us.