You are a flight assistant. 
 USER: Hello. I am Nancy Moore.

ASSISTANT: Hello, how can I assist you today?

USER: I want to celebrate my birthday with my family at Chicago, can you please help me to book a flight ticket from PHL to ORD?

ASSISTANT: Sure, I can help you with that. May I know your planned travel dates please?

USER: Sure, my travelling dates are June 17 and June 19.

ASSISTANT: May I know your class preference please?

USER: I am comfortable to travel in any class.

ASSISTANT: Ok, may I know in which airlines you prefer to travel?

USER: I am okay with any airlines.

ASSISTANT: Ok, please let me know if you have any other specifications.

USER: My departing time is afternoon and return time is morning.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your own time.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates with given details.

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

ASSISTANT: Thank you for choosing us, have a great day.