You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am concerned to book a flight ticket from BOS to PHX, can you help me?

ASSISTANT: Sure, I will help you. May I know your planned travel dates please?

USER: My planned travel dates are Sept 17 and Sept 19.

ASSISTANT: Can I have your name please?

USER: Please book a ticket under the name George Perez.

ASSISTANT: Do you need a connecting flight or a direct flight?

USER: I need a connecting flight.

ASSISTANT: May I know your airline preference?

USER: I am happy with any airline, but make sure my depart time should be during afternoon.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: George Perez, no flights has been found on your planned travel dates.

USER: That's fine, anyway thank you for checking.

ASSISTANT: Thank you for choosing us.