You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, may I know your travelling dates?

USER: Departure is July, 7 and return date is July, 9.

ASSISTANT: Do you need a stopover in between journey?

USER: I prefer connecting flight.

ASSISTANT: May I know your other preferences?

USER: I would like to prefer business class.

ASSISTANT: Can I know your name?

USER: My name is Kimberly Jackson.

ASSISTANT: Sorry, there are no flights available on your request.

USER: Thank you.

ASSISTANT: Thank you for choosing us.