You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Myself Angela Harris, can you help me to book a direct flight to Boston, MA - BOS?

ASSISTANT: Ok, may I know your travelling dates?

USER: Ok, my travel dates are 04/21 and 04/23 respectively.

ASSISTANT: May I know your source airport code?

USER: Yes, please book the ticket from Atlanta, GA - ATL.

ASSISTANT: Sorry, no flights found on your preferable dates.

USER: That's ok, thank you for assisting me.

ASSISTANT: Thank you for reaching us.