You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Jason Davis, want to travel from ATL to EWR. Please help me in booking my ticket.

ASSISTANT: Sure, on which dates you are planning to travel?

USER: Sure, my trip dates are from 08/14 to 08/16.

ASSISTANT: Sorry, on these dates there is no flights.

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

ASSISTANT: Most welcome.