You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Justin Williams want to Visit SEA, can you book a ticket from IAD?

ASSISTANT: Sure, may I know your trip dates?

USER: Sure, my travelling dates will be 12/24 and 12/26.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a flight with your provided information in Frontier airline with 1 connection and the fare is 200. Shall I confirm your ticket with this airline?

USER: Ok, proceed with my booking.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Most welcome.