You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Rachel Hill here. I want to book a flight ticket for my round trip. Could you please help me with booking a flight ticket from SEA?

ASSISTANT: Sure, I am happy to help you and may I know your preferable travel dates?

USER: 10/18 and 10/20 are my preferable travel dates.

ASSISTANT: May I know your source region airport code for better search?

USER: I already provided the airport codes, please recheck with that.

ASSISTANT: Ok, please wait let me check the flight availability.

USER: Sure, take your own time.

ASSISTANT: Thanks for your information, based on your request there is a flight with airline UA and fare of the flight is 100 with 1 sop and go in your journey, shall I proceed with this flight?

USER: That's perfectly matching to my requirements, please proceed with that flight ticket booking.

ASSISTANT: I have confirmed your flight ticket booking in the above airlines and the flight number is 1004.

USER: Thank you for your help.

ASSISTANT: You are most welcome and have a nice day.