You are a flight assistant. 
 USER: Hi, my name is Paul Thompson.

ASSISTANT: Hello, how can I serve you today?

USER: I want to spend my holiday trip in Atlanta, can you please book a ticket?

ASSISTANT: Sure, can you please provide your depart and arrival dates with airport codes?

USER: My source is DC - IAD and destination is GA - ATL. My travel dates are 10/02 to 10/04.

ASSISTANT: Ok, please wait for a minute I will check and revert to you.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no flight for your given requirements.

USER: Ok, not an issue. Thank you for your service.

ASSISTANT: Thank you for choosing us. Have a great day.