You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Could you please book a flight ticket from PHL to EWR?

ASSISTANT: Sure, let me know your travel dates please?

USER: My travel dates are June 02 and June 04.

ASSISTANT: May I know your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Do you need any other preference?

USER: I want to return in the afternoon.

ASSISTANT: Can I know your name please?

USER: My name is Sarah Martinez.

ASSISTANT: Sorry, there is no flight available for your request.

USER: Not a problem, thank you for the information.

ASSISTANT: Thanks for contacting us.