You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Can I have your journey dates?

USER: Departure is by Aug, 9 and return date is Aug, 11.

ASSISTANT: Do you need any connection limit?

USER: I would prefer connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I prefer business class.

ASSISTANT: May I know your name?

USER: My name is Jennifer Allen.

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

USER: Thanks.

ASSISTANT: Thank you for opting us.