You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am planning to book a flight ticket to IAH from DFW, can you please help me out?

ASSISTANT: Sure, can you share me your trip dates?

USER: Sure, my trip dates are Feb 19 and Feb 21.

ASSISTANT: Do you have any connection limit?

USER: I prefer direct flight.

ASSISTANT: Is there any other specifications?

USER: I prefer economy class.

ASSISTANT: May I know your good name?

USER: My name is Michelle Turner.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.