You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Michael Smith. I planned to meet my friend in OAK, can you please help me to book a flight ticket from DCA?

ASSISTANT: Sure, I will help you. Can you please share your planned trip dates?

USER: I prefer to travel on Nov 14 and Nov 16.

ASSISTANT: Do you have any limits on number of connections?

USER: I would like to depart in afternoon in 1 connecting flight.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there are no flights available based on your details.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your information.