You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Samuel Roberts. Can you please book a flight ticket from IAD to SEA?

ASSISTANT: Sure Roberts, could you please provide me with your dates of journey?

USER: Sure, I need to travel on dates of 06/19 and 09/21.

ASSISTANT: Please be hold on for a moment.

USER: Sorry, I have planned to return on 06/21.

ASSISTANT: There is a flight with the connecting flight of fare 300 and the airline is naming as UA, are you ok with this booking?

USER: That is fine, please proceed with booking.

ASSISTANT: Ok, your booking is done with the flight number 1025.

USER: Thank you for your help.

ASSISTANT: You are welcome, have a pleasant journey.