You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I would like to travel from ATL to IAD. Please book a flight ticket for me.

ASSISTANT: Could you please provide your name to proceed further?

USER: I prefer to travel from 01/19 to 01/21 dates and I'm Daniel Taylor.

ASSISTANT: Sorry, there is no flight available at your request. Thank you for reaching us.

USER: It's ok.

ASSISTANT: Have a nice day.

USER: Thank you for the information.