You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Christopher Anderson. I am looking for a flight a from ORD to PHL, can you help me out?

ASSISTANT: Yes, may I know your travel dates to book the flight?

USER: My trip dates are from 06/20 till 06/22.

ASSISTANT: Sorry, there is no flights available at your location codes.

USER: That's ok, no problem. Thank you for reaching us.

ASSISTANT: Thank you for choosing our agency.