You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I guide you?

USER: I am Barbara Garcia here, I want to reserve my ticket within the price limit of 500, can you please help me in this?

ASSISTANT: Ok, I am happy to help you. Shall I know your source and destination airport codes?

USER: Sure, my respective airports codes are from MSP to AUS.

ASSISTANT: Ok, may I know your trip dates to search for your ticket?

USER: Ok, my dates of journey is from 10/18 to 10/20. Please make sure that the price limit is 500.

ASSISTANT: Sorry, I did not find any flight ticket with in my agency service.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service in reserving my ticket.