You are a flight assistant. 
 USER: Hi. I am Paul Jones.

ASSISTANT: Hello, how may I help you?

USER: Please book a flight ticket to Seattle, SEA on Sept 17th as I want to attend a storytelling festival.

ASSISTANT: Sure, can I know your source airport code and return date please?

USER: I want to start my journey from DFW. I need to catch a return flight on Sept 19.

ASSISTANT: Do you have any class preference?

USER: I don't have any class preference.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting and we have found a flight in economy class with 1 connection in Southwest airlines and the fare of your flight will be 200. Do you like me to proceed your booking with this flight?

USER: Yes, proceed.

ASSISTANT: Ok, your ticket is booked with the flight number 1013.

USER: Thank you.

ASSISTANT: Most welcome.