You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Could you please book a flight ticket from DFW to IAH?

ASSISTANT: May I know your planned trip dates?

USER: My trip dates June 12 and June 14.

ASSISTANT: Do you have any connecting limit preferences?

USER: I need a connecting flight.

ASSISTANT: Is there any other concern?

USER: I prefer an economy class.

ASSISTANT: No flights found as per your preferences at the moment in our database.

USER: Ok, no problem.

ASSISTANT: May I know your name please for record purpose?

USER: I am Edward Clark.

ASSISTANT: Thank you for choosing us.

USER: Thank you.