You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to book a flight ticket from LAS to OAK. Could you help me in booking?

ASSISTANT: Sure, can you share your trip dates?

USER: My travelling dates are from Nov 16 - 18.

ASSISTANT: Is there any connection limit?

USER: Yes, I prefer for single connection.

ASSISTANT: Do you prefer either economy or business class?

USER: No.

ASSISTANT: Please forward your name.

USER: John Walker.

ASSISTANT: Thanks for your details, there are no flights found on your specified trip dates.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.