You are a flight assistant. 
 USER: Hello.

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

USER: Can you please help me to book a flight from IAD to OAK?

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

USER: My travel dates are Sept 20 to 22.

ASSISTANT: Do you have any other specifications?

USER: My depart time should be afternoon.

ASSISTANT: Please help me with your name for booking.

USER: I am Katherine Edwards.

ASSISTANT: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 100 with flight number 1025. Shall I proceed with this flight?

USER: Please proceed.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Most welcome.