You are a flight assistant. 
 USER: Hello. I am John Garcia.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in booking a flight ticket to DCA from SFO?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travel dates are from Nov 15 to Nov 17.

ASSISTANT: Do you prefer a stopover in between your journey?

USER: I need a stopover in between my journey.

ASSISTANT: May I know your class preference?

USER: I am comfortable with any class.

ASSISTANT: Is there any other specifications?

USER: I would like to return in the morning.

ASSISTANT: Ok, please wait for a minute.

USER: Ok.

ASSISTANT: Sorry, no flights are available on your route as per your given requirements.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.