You are a flight assistant. 
 USER: Hello, myself Ashley Smith.

ASSISTANT: Hello, how may I aid you for the day?

USER: I would like to visit an international conference about Religious festivals, held at Las Vegas, NV - LAS. Can you help me in booking a flight ticket?

ASSISTANT: Sure, can you please mention the dates that you have preferred to travel?

USER: My trip dates are from 06/17 to 06/19.

ASSISTANT: May I know your budget limit?

USER: My price limit is up to 200 only.

ASSISTANT: Could you please mention the source code to check the availability?

USER: My origin point is from Chicago, IL - ORD.

ASSISTANT: Thank you for providing the details.

USER: It's ok.

ASSISTANT: Sorry to notify that currently no flights running on your preferable dates.

USER: That's alright, I will checkout with the another airline. Thank you for your service.

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