You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: I am Justin Nelson, can you help me to book a flight from EWR to PHL?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are 02/13 and 02/15.

ASSISTANT: Do you need any specifications?

USER: Please book a business class ticket.

ASSISTANT: Can I know your preferences?

USER: I want to return at afternoon.

ASSISTANT: Sorry, there are no flights found.

USER: No issues, thank you for your time.

ASSISTANT: Thank you for reaching us.