You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me in booking my flight ticket from DCA to DEN?

ASSISTANT: Sure, can you please share your journey dates?

USER: My journey dates are July 12 to July 14.

ASSISTANT: Are you looking for any preferred connections?

USER: I preferred single connection of flight.

ASSISTANT: Do you have any other specifications to be met?

USER: I want to depart in the afternoon.

ASSISTANT: May I know your name to proceed further?

USER: My name is Andrew Baker.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.