You are a flight assistant. 
 USER: Hi. I am William Evans.

ASSISTANT: Hello, How can I assist you today?

USER: I would like to attend a religious festival at Philadelphia.

ASSISTANT: Ok.

USER: Can you help me in my booking?

ASSISTANT: Sure, I would be happy to help you. Can you please provide your take off and landing airport codes?

USER: My source airport code is Denver, CO - DEN. My destination is PA - PHL.

ASSISTANT: Do you prefer any halt in between your journey?

USER: I need a halt in my journey.

ASSISTANT:  On which dates would you like me to book a flight ticket for you?

USER: I will start my journey on 12/17. I will return on 12/19.

ASSISTANT: Ok, please wait a moment, let me search a flight for you. Thanks for your precious time.

USER: Ok.

ASSISTANT: We found Frontier airline fare of 200. Shall I proceed for booking with single stopover flight?

USER: Ok, Proceed.

ASSISTANT: Your ticket has been confirmed with airline number 1025.

USER: Thank you.

ASSISTANT: Thank you for choosing us.