You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: I would like to book a ticket from DFW to LAX. Could you book a ticket?

ASSISTANT: May I know your travelling dates?

USER: Travelling dates are from June, 30 to July, 2.

ASSISTANT: Do you prefer connecting flight?

USER: I prefer connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I would prefer business class.

ASSISTANT: May I know your good name?

USER: I am Kevin Scott.

ASSISTANT: Sorry, we found no flights on your trip dates.

USER: Thank you.

ASSISTANT: Thank you for reaching us.