You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please book a flight ticket to Atlanta, ATL?

ASSISTANT: Sure, can you help me with your journey dates?

USER: I am planning a surprise party to my sister on the occasion of her birthday, so please check flights on 04/30. I will return on 05/01.

ASSISTANT: May I know your origin point?

USER: New York, LGA is my source point.

ASSISTANT: Can you help me with your name?

USER: I am Jeffrey Thomas.

ASSISTANT: Sorry, no flights found on your given details.

USER: Ok. Thanks for the information.

ASSISTANT: Thank you for reaching us.