You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you aid me to book a flight ticket from DCA to DEN?

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your preferable dates of travelling?

USER: I planned my trip on the dates Apr 6 and Apr 8.

ASSISTANT: Please confirm your name to proceed further.

USER: Myself Steven Young.

ASSISTANT: What is your max connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Do you need any other requirements?

USER: I prefer morning flight for my return journey.

ASSISTANT: We regret to inform you that there is no flights going on your way.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you for opting us.