You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Amy Lewis. I want to book a direct flight from OAK to IAD. Could you help me in booking?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My travelling dates are from Apr 10 to 12.

ASSISTANT: How much you can afford for airfare?

USER: I can spend 200 for this trip.

ASSISTANT: Do you need any halt in between your journey?

USER: I have mentioned already above.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Amy Lewis, there are no direct flights available in your route.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.