You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, How can I serve you?

USER: Please book a ticket from Detroit, MI-DTW to Denver, CO-DEN, for an Auto show.

ASSISTANT: Sure, May I know your name?

USER: My name is Steven Harris.

ASSISTANT: Please help me with your travel dates.

USER: My travel dates are from 07/19 to 07/21.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Thank you.

ASSISTANT: Thank you for availing us.