You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am George Edwards. I want to book a flight ticket on 05/08 and 05/10, so can you help me with booking please?

ASSISTANT: Sure, we are pleased to serve you. May I know your airport codes?

USER: Yes, my airport codes are DC-DCA and GA-ATL.

ASSISTANT: Sorry to inform you that, no flights are available on your requirement.

USER: That's ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the response.