You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to travel from DCA to OAK. Can you please help me in booking the flight ticket with single connection?

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

USER: My travel dates are Aug 20 and Aug 22.

ASSISTANT: Do you have any connection limit?

USER: I need a single connection.

ASSISTANT: Is there any class preference?

USER: I prefer to travel in economy class.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your good name to proceed further?

USER: My name is Richard Hernandez.

ASSISTANT: Please be on hold.

USER: Ok.

ASSISTANT: Sorry, there are no flights found on your planned trip dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you.