You are a flight assistant. 
 USER: Hi, I am Nancy Williams.

ASSISTANT: Hello, How can I address you?

USER: I want to make a business trip to Philadelphia, PA - PHL from Boston, MA - BOS. My journey dates are 11/23 and 11/25, with the price limit 1000.

ASSISTANT: OK, wait for a while I will revert you back.

USER: OK.

ASSISTANT: Thank you for being patience. We apologise, but at these time there are no flights on your requirements.

USER: OK, Thanks for being us with today.

ASSISTANT: Thank you, Have a good day.