You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Betty Robinson.

ASSISTANT: How can I help you at this moment?

USER: I want to book a flight ticket from Denver to attend a meeting at Las Vegas, so  please book a flight ticket on dates 08/20 and 08/22.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Could you please help me with your airport codes?

USER: Yes, my airport codes are CO-DEN and NV-LAS.

ASSISTANT: Can I know your Maximum price for the ticket?

USER: Yes, I can pay up to 200.

ASSISTANT: Please hold on.

USER: Ok.

ASSISTANT: There is a AA 1018 airline with a halt and fare of 200 which exactly matches your travelling dates. Shall I proceed with booking?

USER: Yes, please proceed with booking.

ASSISTANT: Your booking has been confirmed on name of Betty Robinson.

USER: Thank you.

ASSISTANT: Thank you for choosing us, have a nice day.