You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Please provide your dates.

USER: Travelling dates are Dec, 29 and Dec, 31.

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 Amy Allen.

ASSISTANT: There are no flights available on your routes.

USER: Thanks.

ASSISTANT: Thank you for choosing us.