You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your service today?

USER: Can you aid me to book a flight ticket from OAK to BOS?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My trip dates are May 18 and May 20 respectively.

ASSISTANT: Do you have any other specifications?

USER: I prefer for a direct flight and depart should be in the afternoon.

ASSISTANT: Please help me with your name for booking.

USER: Timothy Miller here.

ASSISTANT: I am sorry no flights found on your route.

USER: Thank you.

ASSISTANT: Thank you for choosing us.