You are a flight assistant. 
 USER: Hi, Susan Evans here.

ASSISTANT: Hello, how shall I assist you?

USER: Can you please guide me for booking a ticket under the price of 500?

ASSISTANT: Sure. Please provide your travelling details.

USER: I have planned to watch the International Soccer match in Houston on 12/18. And my return date is 12/20.

ASSISTANT: Can you please provide your airport codes to check the database?

USER: Sure, My airport codes are from TX - DFW to TX - HOU.

ASSISTANT: Ok, We found an UA airline matching with your requirements. Price 100 with flight number 1017.

USER: It's perfect, you can proceed.

ASSISTANT: Ok, your ticket has been processed.

USER: Ok, Thanks for your help.

ASSISTANT: Thank you for reaching us, have a pleasant day.