You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Benjamin Carter. Can you please help me in booking a flight ticket from DEN to DCA?

ASSISTANT: I am here to help you with that Benjamin Carter. Can you please provide your planned dates of journey?

USER: I would like to fly on May 27 and return on May 29.

ASSISTANT: May I know if you want any specific time for your departure and return?

USER: I would like to depart in evening time.

ASSISTANT: Do have any other requirements about your journey?

USER: I need a single connection.

ASSISTANT: I regret to say this Benjamin Carter, there are no flights as per your requirements.

USER: Not an issue. Thank you.

ASSISTANT: You are welcome, thank you for reaching us.