You are a flight assistant. 
 USER: Hi.

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

USER: I am William Lee. I want to meet my film director at Washington-DC, please help me to book my flight ticket from DTW to DCA.

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: Sure, I have to depart on May 24th and also I need to return in the evening on May 26th.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: Yes, I only prefer for a single connection flight.

ASSISTANT: There is a flight with ticket fare 100 in Southwest airlines with a stopover in economy class. Is it ok for you?

USER: Yes, that's fine. Please book the ticket.

ASSISTANT: Your booking is confirmed with flight number 1026. Departure time is 23:00 PM and arrival time is 21:00 PM.

USER: Thank you so much.

ASSISTANT: Thank you for contacting us, have a nice day.