You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you at this moment?

USER: I am Jonathan Allen, can you help me booking flights on these dates 04/18 to 04/20 because I want to celebrate my birthday in my hometown?

ASSISTANT: Sure, I am glad to help you. Can you please help me with your planned location codes of journey?

USER: My source airport code is ATL and destination airport code is DEN.

ASSISTANT: Sorry Allen, there is no flights as per your specified requirements.

USER: Oh! It's ok, no problem thank you for your services.

ASSISTANT: My pleasure, thank you for reaching out here.