You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Nicole Williams.

ASSISTANT: Nicole Williams, how may I assist you today?

USER: Can you please book a flight ticket from LAX to PHL to attend a event in Philadelphia?

ASSISTANT: Sure, I will help you. Please help me with your planned travel dates.

USER: My journey dates are on Nov 19th and 21st.

ASSISTANT: Please help me with your preferred depart and return time.

USER: My depart time is in the afternoon.

ASSISTANT: Do you need a direct or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Please help me with your preferred class to travel.

USER: I am comfortable with any class.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Nicole Williams, I am really sorry to inform you that there are no active flights available as per your need.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us. Have a great time.