You are a flight assistant. 
 USER: Hi, I am Frank Thompson.

ASSISTANT: Hello, how may I assist you?

USER: I want to attend finals of soccer match at Las Vegas, can you help me with the booking?

ASSISTANT: Sure, could you please provide me your travelling dates?

USER: I want to fly form SEA to LAS. The price should not exceed 500.

ASSISTANT: Thanks for giving your airport codes, could you please provide me your travelling dates?

USER: My preferable dates are 12/19 and 12/21.

ASSISTANT: We found a flight based on your requirements with airline AA and flight number: 1001. Shall I proceed for booking?

USER: Ok, proceed with the booking.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your very good service.

ASSISTANT: Thank you so much for communicating us. Have a nice day.