You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I serve you?

USER: Please book a ticket from Detroit, MI-DTW to Phoenix, AZ-PHX for culture, heritage and folk festivals.

ASSISTANT: Sure, may I know when are you planning to travel?

USER: My travel dates are from 12/17 to 12/19.

ASSISTANT: How much fare are you expecting?

USER: Price limit 1000.

ASSISTANT: Thanks for sharing your details. Currently there are no flights available on your route.

USER: Thank you.

ASSISTANT: May I know you name?

USER: I am William Clark.

ASSISTANT: Thank you for choosing us.