You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I'm Mark Nelson, want to travel from ORD to MCO. Please help me in ticket booking.

ASSISTANT: Sure, may I know your travelling dates please?

USER: My travelling dates are from 01/17 to 01/19.

ASSISTANT: Sorry, there is no flight found as per your requested dates.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.