You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I render you at this moment?

USER: I need to book a ticket from Oakland to Charlotte. Could you book a ticket?

ASSISTANT: Sure, may I know your good name please?

USER: I am Melissa Roberts.

ASSISTANT: Ok, do you need any break in between the journey?

USER: I prefer connecting flight.

ASSISTANT: Ok, please share your travelling dates to check with the availability of flights.

USER: Travelling dates are June, 09 and June, 11.

ASSISTANT: Can you please share your corresponding airport codes?

USER: Airport codes are OAK and CLT.

ASSISTANT: Do you have any time specifications to travel?

USER: I would like to depart in the afternoon time.

ASSISTANT: Do you prefer business or economy class?

USER: I prefer business class ticket,.

ASSISTANT: Ok, please wait for few minutes.

USER: Sure.

ASSISTANT: There are no flights found on your requested dates.

USER: Thank you.

ASSISTANT: Thank you for reaching us.