You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you help me to book a flight ticket from LAS to DTW?

ASSISTANT: May I know your connection limit?

USER: I prefer direct flight for this trip.

ASSISTANT: May I know your travelling dates?

USER: My trip dates are July 09 and July 11.

ASSISTANT: Do you have any other preference?

USER: I would like to prefer normal cost airline.

ASSISTANT: May I know your name?

USER: I am Steven Scott.

ASSISTANT: Sorry, no flights available on your route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.