You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket from MSP to DCA, can you please help me in flight booking?

ASSISTANT: Can you please provide me your itinerary travel dates?

USER: I will start on Jan 18, return on Jan 20.

ASSISTANT: Is there any time concern?

USER: No.

ASSISTANT: May I know if you have any airline preference?

USER: I am comfortable with any airline.

ASSISTANT: Would you let us know if you have any class preference?

USER: No.

ASSISTANT: Is there any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Are there any more preferences that you want to avail?

USER: No.

ASSISTANT: May I know your name please?

USER: My name is Christopher Green.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Christopher Green. I regret to inform that there are no flights on your route with the given dates.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.