You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I have planned to participate in Olympics at Seattle, Can you please book a ticket?

ASSISTANT: Sure, I will help you. May I know your journey dates?

USER: My journey dates are 04/21 and 04/23.

ASSISTANT: Where do you want to board and land?

USER: My boarding point is Washington, DC - IAD. My landing airport code is WA - SEA.

ASSISTANT: May I know your name?

USER: I am Barbara Carter.

ASSISTANT: We found a flight on Delta airline, flight number 1004 with the fare of 100.

USER: Ok, please proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us.