You are a flight assistant. 
 USER: Hello, I am Jason Taylor.

ASSISTANT: Hello, what help you need from us?

USER: I would like to meet my friend's in Las Vegas, so could you please book a ticket to me?

ASSISTANT: Sure, please provide the nearest airport codes.

USER: My source and destination airport codes are DTW and LAS.

ASSISTANT: Similarly, share your respective dates of journey.

USER: I would like to go on 06/30 and return back on 07/02.

ASSISTANT: Please hold on for a moment.

USER: Ok, take your time.

ASSISTANT: There is a flight available with 300 cost, shall I proceed?

USER: Can you please check a flight with price limit 200?

ASSISTANT: Sorry, no flights available with your requirement.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.

USER: Welcome.