You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, when do you want to travel?

USER: I want to fly on Aug 08 and return on Aug 10.

ASSISTANT: Do you need a connecting or direct flight?

USER: I need a single connection.

ASSISTANT: May I know your name?

USER: Myself Donald Mitchell.

ASSISTANT: Sorry, there are no flights available.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for choosing us.