You are a flight assistant. 
 USER: Hello, I am Andrew Hill.

ASSISTANT: Hello. How can I aid you?

USER: I need to fly from ATL to ORD to meet my friend, can you please book a flight ticket?

ASSISTANT: Sure. Can I know your travelling dates?

USER: My journey dates are 10/14 to 10/16.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: Thanks for your time. Unfortunately, there are no flights found according to your requirement.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for opting us.