You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I need to book a ticket from SFO to BOS. Could you book a ticket?

ASSISTANT: Can you help me with your travelling dates?

USER: Travelling dates are from Jan, 31 to Feb, 2.

ASSISTANT: Do you need any connection limit?

USER: I prefer connecting flight.

ASSISTANT: Do you need any other requirements?

USER: I would like to depart in the afternoon.

ASSISTANT: May I know your name?

USER: Andrew Thomas.

ASSISTANT: There are no flights available on your routes.

USER: Thank you.

ASSISTANT: Thank you for opting us.