You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you help me with booking ticket from DCA to DEN?

ASSISTANT: Sure, can I know your travelling dates?

USER: Ok, my trip dates are from Dec 31 to Jan 02.

ASSISTANT: On which name should I reserve the flight ticket?

USER: Kimberly Lewis.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I would like to depart in the evening.

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

USER: It's ok, thanks for your time.

ASSISTANT: Thank you for reaching us.