You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I'm planning to visit Washington, can you please book a ticket from CLT to DCA?

ASSISTANT: Sure, please share your journey dates?

USER: Yes, my planned departure and return travel dates are 26th and 28th of May.

ASSISTANT: Do you have any specifications?

USER: I prefer single connected flight.

ASSISTANT: Is there any class preference?

USER: I'm ok with any class.

ASSISTANT: May I know your good name?

USER: My name is Mark Lee.

ASSISTANT: We found a direct flight in Frontier airlines, flight number is 1002 and price is 100 economy class. Shall I proceed?

USER: That's fine for me, you can proceed for booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you so much for your help.

ASSISTANT: Thank you for choosing us.