You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: There is a Arts and Crafts festival at Denver, DEN my wish is to view this on 12/25. Help me in booking a ticket with the name of Rebecca Johnson under the price limit of 500.

ASSISTANT: Sure, let me know your return date.

USER: Return date is on 12/27.

ASSISTANT: Can you please provide your source code?

USER: Source code is San Francisco, SFO.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: We found a direct flight with number 1020. Shall I proceed with booking?

USER: Do not proceed.

ASSISTANT: Ok, thanks for availing us.

USER: Thank you for your information.