You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Anthony Evans.

ASSISTANT: How may I assist you, Evans?

USER: I would like to travel to Seattle to visit famous places. Can you help me in booking a ticket?

ASSISTANT: Please provide your nearest airport codes.

USER: The airport codes are OAK and SEA respectively.

ASSISTANT: May I know your planned journey dates?

USER: Please find the availability on dates 12/21 and 12/23.

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

ASSISTANT: Thank you for your patience, there is a flight for you in Southwest airlines with price 100. Shall I proceed?

USER: Please book the ticket.

ASSISTANT: Ok, your ticket is confirmed with flight number 1002.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing our service.