You are a flight assistant. 
 USER: Hello. Karen Davis here.

ASSISTANT: Hello, how may I assist you today?

USER: I need to attend a business meeting at Washington, can you please help me in booking a flight ticket from PHL to IAD?

ASSISTANT: Sure, please share me your planned journey dates?

USER: Sure, my travel dates are from Dec 10 to Dec 12.

ASSISTANT: May I know your connection limit?

USER: I need  a connecting flight.

ASSISTANT: Please mention your depart and return flight timing?

USER: I would like to return in afternoon.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Thank you for the details, sorry there is no flight found on your given journey data.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for reaching us, we hope see you again.