You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am looking for a direct flight, can you find a flight for me?

ASSISTANT: Sure, may I know your airport codes?

USER: My location airport codes are from PHL to ORD.

ASSISTANT: Can you please tell me your airport dates?

USER: My travel dates are from 04/28 till 04/30.

ASSISTANT: To proceed further may I know your name?

USER: Myself John Thompson.

ASSISTANT: Sorry, no flights found with your requirement.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Thank you for opting us.