You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I have to book a flight ticket from Charlotte CLT to Oakland OAK. Can you find a flight ticket for me?

ASSISTANT: Sure, On which dates would you like me to book a flight ticket for you?

USER: Yes, I am planning to travel on these days that is on Apr 07 and return on Apr 09.

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

USER: Yes, I need a business class to travel.

ASSISTANT: Let me know your connection limit.

USER: I need a single connecting flight.

ASSISTANT: Do you have any other requirements?

USER: I want to depart in the evening time.

ASSISTANT: May I know your good name please?

USER: Yes, I am Robert White.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: That's fine, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.