You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am David Davis. Can you help me booking a flight ticket from LAS to JFK?

ASSISTANT: Sure, let me know your travelling dates.

USER: I will start on 09/05 and return on 09/07.

ASSISTANT: Please share your connection limit.

USER: I need a break in my journey.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Is there any preferences?

USER: I need to return in the evening time.

ASSISTANT: Sorry, there are no flights available based on your details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.