You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: I am Nicole Campbell. I would like to travel from OAK to DCA. Can you please help me to book a ticket?

ASSISTANT: Sure, we are here to help you. May I know your trip dates?

USER: My journey starts on Sept 20 and return on Sept 22.

ASSISTANT: Do you need any halt in your journey?

USER: Yes, I need a connecting flight.

ASSISTANT: Do you have any other preferences?

USER: I prefer business class.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for your time, there are no flights available on your requested dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for availing us.