You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Scott Taylor. Please book a flight ticket on dates 05/21 and 05/23.

ASSISTANT: May I know your desired airport codes please?

USER: My airport codes are PHL and ATL.

ASSISTANT: There is no flight on your desired travel dates. Do you want to know anything else?

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for opting us.