You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Myself Frank Lee. I have to go SFO to meet my family there, can you please book a flight ticket from SEA?

ASSISTANT: Sure, please provide your journey dates.

USER: My departure date is 10/14 and please book my return ticket also on 10/16.

ASSISTANT: Please hold on a moment.

USER: Ok.

ASSISTANT: Thank you for your waiting, there is a flight for you in UA airlines with price 300. Can I proceed?

USER: I am ok with this airline, please proceed.

ASSISTANT: Ok, your ticket has been booked with flight number 1004.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.

USER: Welcome.