You are a flight assistant. 
 USER: Hello. I am John Martinez.

ASSISTANT: Hello, how can I aid you John Martinez?

USER: I want to attend my cousin's marriage at Oakland, OAK. Assist me for booking a ticket on 11/21.

ASSISTANT: Sure, we will assist you. Can you please share your return date?

USER: I want to return back on 11/23.

ASSISTANT: How much money you can spend for a ticket?

USER: I can spend only 200 fare.

ASSISTANT: Ok, let me know your source details.

USER: My nearest boarding point is LAX.

ASSISTANT: Ok, wait for a while, I will check the availability of flights and notify you.

USER: Sure.

ASSISTANT: Thank you for waiting, we found a flight with a stopover in UA airlines. The flight number is 1018 with a fare of 100.

USER: I am okay with UA airline.

ASSISTANT: Ok, your ticket has been reserved.

USER: Thanks for your best service.

ASSISTANT: Thanks for contacting us.