You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to visit Oakland to meet my cousin, can you please help me to book a flight ticket from CLT to OAK?

ASSISTANT: May I know your desired travel dates please?

USER: My travelling dates are Jan 27 and Jan 29.

ASSISTANT: Do you have any other specifications?

USER: My return time is evening.

ASSISTANT: Do you have any requirements?

USER: I need a connecting flight.

ASSISTANT: May I know your name please?

USER: My name is Susan Martin.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.