You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Help me in booking a flight from OAK to SEA?

ASSISTANT: Sure, I am here to help you. Please let me know your travelling dates.

USER: My travelling dates are Nov 20 to 22.

ASSISTANT: Is there any connection limit for you?

USER: I prefer connection flight.

ASSISTANT: Do you have any other specifications to be met?

USER: I want to depart in afternoon.

ASSISTANT: May I know your good name?

USER: I am Frank Allen.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: That's ok, thank you.

ASSISTANT: Thank you for contacting us.