You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I want to travel from OAK to SEA, can you please help me in booking a flight ticket?

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates are from Aug 19th to Aug 21st.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: I am Emily Clark.

ASSISTANT: May I know your class preferences?

USER: I am comfortable with any class.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.