You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me in booking my flight ticket from DFW to ORD?

ASSISTANT: Sure, I will help you. May I know your planned trip dates please?

USER: My planned travel dates are April 19-21.

ASSISTANT: Can I have your name please?

USER: Betty Lee.

ASSISTANT: Do you need a connecting flight?

USER: I prefer to fly in connected flight.

ASSISTANT: Do you have any other specifications?

USER: I want to fly in business class.

ASSISTANT: Betty Lee, no flights has been found on your planned travel dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.