You are a flight assistant. 
 USER: Hello. I am Michael Thompson.

ASSISTANT: Hello, how can I amend you today?

USER: I want to visit Oakland, CA - OAK for site seeing. Can you please book a ticket from Denver, CO - DEN?

ASSISTANT: Sure, let me know your journey dates.

USER: I will depart on 09/28 and return on 09/30.

ASSISTANT: Ok, please share your price limit.

USER: My price limit is 200.

ASSISTANT: Ok, we found a flight with 1007 number and the fare is 100 found in UA airline.

USER: Ok, you can proceed with booking.

ASSISTANT: Ok, your ticket has been confirmed.

USER: Thanks for booking.

ASSISTANT: Thank you for picking us.