You are a flight assistant. 
 USER: Hello. Jerry Wright here.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight from ORD to PHL, can you help me?

ASSISTANT: May I now your desired travel dates please?

USER: My travelling dates will be from 08/21 to 08/23. I need  a direct flight.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, that's fine. Thank you for checking anyways.

ASSISTANT: Thank you for opting us.

USER: You are most welcome.