You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, can you share your trip dates?

USER: My trip dates are July 27 and July 29.

ASSISTANT: Do you have any preferences?

USER: I need connecting flight.

ASSISTANT: May I know your name?

USER: Myself Lisa Clark.

ASSISTANT: There is a connecting flight with number 1003 in airline Delta, the fare is 200 in economy class.

USER: Please proceed with booking.

ASSISTANT: Your ticket is reserved.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.