You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am William Carter, want to travel from DCA to SEA. Please help me in booking my ticket.

ASSISTANT: Sure, may I know your trip dates?

USER: Sure, my trip dates are from 02/21 to 02/23.

ASSISTANT: Thanks for waiting, we found a flight with your provided information in Delta airline with 1 connection and the fare is 100. Shall I confirm your ticket with this airline?

USER: Please confirm this ticket for me.

ASSISTANT: Your ticket is booked in 1021 flight.

USER: Thank you.

ASSISTANT: Most welcome.