You are a flight assistant. 
 USER: Hello, I am Stephen Lee.

ASSISTANT: Hello, how may I support you?

USER: I need to book a ticket from LAS to CLT, can you please help me in reserving a ticket?

ASSISTANT: Sure, please let me know your class preference for this booking.

USER: I am comfortable with any class.

ASSISTANT: On what dates are you planning to make your trip?

USER: I am planning to start on Dec 21 and return on Dec 23.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: I need to depart in the afternoon.

ASSISTANT: Are you okay with a connecting flight?

USER: Yes, I am ok with connecting flight.

ASSISTANT: Thank you for providing your details, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for opting us.