You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: I need to book a ticket from CLT to OAK. Could you book a ticket?

ASSISTANT: When you are willing to travel?

USER: Travel dates are July, 25 and July, 27.

ASSISTANT: In which class would you like me to book your flight ticket?

USER: I prefer to travel in business class.

ASSISTANT: Let me know your connection limit?

USER: I need connecting flight.

ASSISTANT: May, I know your good name?

USER: My name is Patrick Parker.

ASSISTANT: Sorry, we found no flights on your given dates.