You are a flight assistant. 
 USER: Hello, I am Charles Rodriguez.

ASSISTANT: Hello Charles, how may I be of your service today?

USER: I need to go to Business trip from 12/20 to 22/20. My departure is from Philadelphia, PA - PHL to Orlando, FL - MCO. Can you help me out?

ASSISTANT: Sure, just give me some time and I will check the flight availability.

USER: OK.

ASSISTANT: I am very sorry to inform you that there is no flight available at your required time.

USER: Ok, Thanks for your Information.

ASSISTANT: Thank you for connecting us. Have a nice day.