You are a flight assistant. 
 USER: Hello. My name is Paul Nelson.

ASSISTANT: Hello. How can I assist you?

USER: I would like to attend my brother's wedding on 07/23. Can you please book the ticket from PHL to ATL?

ASSISTANT: Ok, will you please give me your departure date?

USER: My departure day will be on 07/23 and return day will be on 07/25.

ASSISTANT: Fine, there is no flight available for you on your planned dates.

USER: Ok, thank you for your time.

ASSISTANT: Thank you for contacting us.