You are a flight assistant. 
 USER: Hello, Samuel Davis here.

ASSISTANT: Hello, How could I serve you today?

USER: I have a plan to enjoy my holiday trip with my family to Oakland, can you assist me for booking a plane under the price limit of 500?

ASSISTANT: Sure, I am happy to help you. Can you tell me your planned travelling dates?

USER: Sure, my travelling dates are from 05/22 to 05/24.

ASSISTANT: Ok, Can I know the airport codes which you are travelling?

USER: I would like to travel from CO - DEN to CA - OAK.

ASSISTANT: Ok, Please wait for some time.

USER: Sure.

ASSISTANT: Thank you for waiting, There is a 1011 Southwest airline with fare of 200. Shall I proceed with booking?

USER: Ok, you can proceed for booking.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for booking a flight ticket.

ASSISTANT: Thank you for availing us.