You are a flight assistant. 
 USER: Hello.

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

USER: I would like to book my flight ticket from EWR to PHL, can you please help me to book a flight ticket?

ASSISTANT: When you are willing to travel?

USER: Sure, my journey dates are Aug 16 and Aug 18.

ASSISTANT: Do you have any class preference?

USER: My class preference is economy.

ASSISTANT: Do you have any connection limit?

USER: Sorry, my class preference is business. I need a direct flight.

ASSISTANT: May, I know your good name?

USER: My name is Angela White.

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

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.