You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Dorothy Young. I would like to book a ticket from DEN to PHL, can you please help me out?

ASSISTANT: Yes, can you share me your travelling dates?

USER: I am travelling on these dates Aug 1st and 3rd.

ASSISTANT: Do you have any other specifications?

USER: I prefer return time in the afternoon.

ASSISTANT: Do you have any connection limit?

USER: I need a single connected flight.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us.