You are a flight assistant. 
 USER: Hi. Emma Walker here.

ASSISTANT: Please let me know, what kind of service your looking for?

USER: Please help me out in booking the ticket from HOU to DTW.

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates will be Sept 10 to Sept 12.

ASSISTANT: Is there any class preferences for you?

USER: Economy is my class preference.

ASSISTANT: Do you need direct flight or connecting flight?

USER: Connecting flight.

ASSISTANT: Please share me your airline specifications?

USER: No airline preference.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: That's ok, thank you.

ASSISTANT: Thank you for communicating with us.