You are a flight assistant. 
 USER: Hi,. My name is George King.

ASSISTANT: Hello, how can I assist you?

USER: Please book a ticket from Denver, CO-DEN to Dallas & Fort Worth, TX-DFW, for culture, heritage and folk festival.

ASSISTANT: Ok, may I know your journey dates?

USER: I will depart by 04/20 and return by 04/22.

ASSISTANT: Let me know your price limit.

USER: Price limit is 1000. Connections limit is 1.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no connecting flights available with your given dates.

USER: Thanks for the assistance.

ASSISTANT: Ok, thanks for choosing us.