You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am planning to visit Oakland on Nov 06, will you help me in booking the flight ticket?

ASSISTANT: Sure, I am here to help you. Can you please share your airport codes?

USER: My airport codes are DCA and OAK.

ASSISTANT: May I know your return journey?

USER: I would like to return on Nov 08.

ASSISTANT: Is there any class preference?

USER: I always prefer business class.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know your name?

USER: Myself Jack Perez.

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

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.