You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: I am Andrew Clark.

ASSISTANT: How may I oblige you now?

USER: Please book a ticket from New York, NY-JFK to Dallas & Fort Worth, TX-DFW.

ASSISTANT: Ok. Let me know your travelling dates for further process in booking.

USER: Sure. My travelling dates are from 0627 to 06/29.

ASSISTANT: Do you have any specifications?

USER: Yes, price limit is 500. Connections limit is 1.

ASSISTANT: Thanks for sharing your details. We found that there was no flight that matches with your information.

USER: Thanks.

ASSISTANT: Thank you for choosing us. Have a great day.