You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Please help me to book a flight ticket from PHL to EWR?

ASSISTANT: Sure, can you please share your travel dates?

USER: My travelling dates are Sept 12 to Sept 14.

ASSISTANT: May I know your connection limit?

USER: I need a single connection of flight.

ASSISTANT: Do you have any other specification that you are looking for?

USER: I want to depart in the afternoon.

ASSISTANT: May I know your name to proceed further?

USER: Helen Evans here.

ASSISTANT: I am sorry to inform you that there is no flight available at your request.

USER: No problem, thank you.

ASSISTANT: Thank you for contacting us.