You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: Please help me to book a flight ticket from ORD to PHL.

ASSISTANT: When you are willing to travel?

USER: My journey dates are from May, 04 to May, 06.

ASSISTANT: Do you have have any connection limit?

USER: I need a direct flight to fly.

ASSISTANT: May, I know your good name?

USER: Mary Hall.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Thank you for your information.

ASSISTANT: Thank you for reaching us.