You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Anna Davis want to visit LGA, can you book a ticket from ORD?

ASSISTANT: Sure, I am here to help you in booking the flight ticket. May I know your planned travel dates?

USER: Sure, my travelling dates will be 12/23 and 12/25.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting. Here, there are no flights available for your desired dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.