You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Alexander Lee. Can you please assist me in booking a ticket from SEA to DFW?

ASSISTANT: Sure, please provide your price limit.

USER: My price limit is 500.

ASSISTANT: Ok, when do you want to depart and return?

USER: I will depart on 08/19 and return on 08/21.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for your patience, we found a connecting flight in 1017 AA airline. Can I proceed for booking with a fare of 200?

USER: Ok, you can proceed.

ASSISTANT: Sure, your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.