You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to travel from OAK to DCA, please help me to book my flight ticket.

ASSISTANT: Sure, I am here to help you out. May I know your travel dates please?

USER: I want to depart on Jan 11th and return back on Jan 13th.

ASSISTANT: Can you please share your connection limit?

USER: I prefer for a connecting flight.

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

USER: No.

ASSISTANT: May I know your name please?

USER: My name is Mary Scott.

ASSISTANT: Mary Scott, there are no flights available in your route with your preferences.

USER: Sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you for choosing us.