You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I need to book a ticket from PHL to DFW. Could you book a ticket?

ASSISTANT: Sure, let me know your travelling dates.

USER: My travelling dates are from July, 3 to July, 5.

ASSISTANT: May I know your connection limit?

USER: I prefer connecting flight.

ASSISTANT: Do you have any other requirements?

USER: I would like to prefer business class.

ASSISTANT: May I know your name please?

USER: My name is Jacob Johnson.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Thank you.