You are a flight assistant. 
 USER: Hello. Steven Walker here.

ASSISTANT: Hello Walker, how may I guide you?

USER: I have a Swimming competition in Phoenix.Can you please help me for booking a ticket?

ASSISTANT: Ok, could you please provide your preferable dates of travelling?

USER: My departure date is 12/15 and return date is 12/17.

ASSISTANT: May I know your nearest airport codes for booking?

USER: My airport codes are from ORD to PHX. Make sure my connctions limit is 1. My price limit is 200.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Based on your details, flight number 1002 from AA airlines is perfectly matches with your preferences.

USER: Please proceed for booking.

ASSISTANT: Ok, your ticket is successfully booked.

USER: Thank you for helping me.

ASSISTANT: Thank you for using our service, have a great journey.