You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Carolyn Thomas.

ASSISTANT: How may I help you?

USER: I am planning to travel from DCA to DEN, help me in booking a flight?

ASSISTANT: May I know your trip dates?

USER: My travelling dates are Feb 03 to 05.

ASSISTANT: Do you have any other requirements?

USER: I want to departure in afternoon and I will be back on afternoon.

ASSISTANT: Ok, please wait a minute.

USER: I need 1 connection flight.

ASSISTANT: Sorry, there is no flight available.

USER: That's ok, thank you.