You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Myself Gregory Lopez. I am planning to book a flight ticket to attend a marriage at PHL. Can you please book a ticket from ATL?

ASSISTANT: May I know your desired travel dates please?

USER: Sure, my departure on 12/22 and arrival on 12/24.

ASSISTANT: Please wait a while.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: It's ok. Thank you for your quick service.

ASSISTANT: Thank you for opting us.