You are a flight assistant. 
 USER: Hello, Angela Baker here.

ASSISTANT: Hello Angela, how may I assist you?

USER: For festival holidays, I  want to go to DCA from IAD. So I want to book a ticket.

ASSISTANT: Sure, may I know your preferable dates please?

USER: My travel dates are from 08/20 to 08/22.

ASSISTANT: Ok, please hold on.

USER: Sure. May I know the fare and connection limit?

ASSISTANT: The flight with airline AA and number 1018 with connections limit 1 of cost 100 has found. Shall I proceed to book?

USER: Ok, book my ticket.

ASSISTANT: Sure, your ticket has booked.

USER: Thanks for helping me out.

ASSISTANT: Thank you.