You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I need you to book a flight ticket from DTW to DFW. Please help me.

ASSISTANT: Sure, I am ready to help you. Could you please share your travel dates?

USER: September 9 and 11 are my planned travel dates.

ASSISTANT: Is there any class preference?

USER: I am comfortable with any class.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Can you please share your airline preference?

USER: I prefer to fly in a normal-cost.

ASSISTANT: Do you have any other specifications?

USER: Nothing much to state.

ASSISTANT: May I know your name?

USER: I am Cynthia Wilson.

ASSISTANT: Sorry, there are no flights found on your trip dates.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.