You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: I am Kenneth Johnson. Please help me to book a flight ticket from DCA to DEN.

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My journey dates are from July, 06 to July, 08.

ASSISTANT: Ok, may I know your departure and arrival time?

USER: I nee to return in the afternoon.

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

USER: I need a single connecting flight.

ASSISTANT: Ok, please allow me a moment.

USER: Ok.

ASSISTANT: Sorry, there is no flight with your request.

USER: No problem, thanks for your information.

ASSISTANT: You are welcome, have a great day.