You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Carolyn Nelson here. Please help me in booking a ticket from PHL to ORD.

ASSISTANT: Sure Nelson, can I know your travel dates please?

USER: My preferred dates are 08/09 and 08/11.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry Nelson, there are no flights available on your dates.

USER: It's ok, thanks for your help.

ASSISTANT: Thank you for reaching us, have a good day.