You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello! tell me how may I assist you?

USER: My name is Sandra Taylor,want to book a ticket.

ASSISTANT: OK,Sure! can you please tell me your journey codes & dates of your  travelling?

USER: Sure, I want to travel from DFW to DFW. My preferable dates are 12/10 to 12/12.

ASSISTANT: May I know  your connections limit & price of your ticket?

USER: Sure,there should be 1 connection with the price 200.

ASSISTANT: Sorry,Sandra no flights found on your requirements. Thank you.

USER: Oh! it's OK.