You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: I want to travel from DEN to DCA. Can you help me to book a flight ticket?

ASSISTANT: Sure, may I know your scheduled travel dates?

USER: I want to travel in the flight on Jan 02 and Jan 04.

ASSISTANT: Do you have any specifications?

USER: I want to travel in a connecting flight.

ASSISTANT: May I know your name to proceed further?

USER: Brandon King.

ASSISTANT: Ok, please wait for a minute.

USER: Ok, take your time.

ASSISTANT: Sorry, there were no flights found on your route.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for reaching us.