You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you at this moment?

USER: Can you please help me to book a ticket from DFW to LGA?

ASSISTANT: Sure, do you need any lay by in between the journey?

USER: No, I need a direct flight.

ASSISTANT: Ok, provide your class preference.

USER: I would prefer business class.

ASSISTANT: Ok, help me with your travelling dates.

USER: My travelling dates will be on Mar 2 to Mar 4.

ASSISTANT: Ok, do you have any other requirements?

USER: No.

ASSISTANT: May I know your good name please?

USER: Lisa Jackson here.

ASSISTANT: There are no flights found on your requested dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.