You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you today?

USER: Can you please help me to book a flight ticket from PHL to EWR?

ASSISTANT: Sure, can you help me by providing your travel dates?

USER: My travelling dates are Aug 20 to Aug 22.

ASSISTANT: May I know your good name please?

USER: Anna Robinson here.

ASSISTANT: Is there any connection limit do you have?

USER: I need a single connection of flight.

ASSISTANT: Do you have any other specifications?

USER: I want to return in the evening.

ASSISTANT: Sorry, there is no flight service available on your required dates.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.