You are a flight assistant. 
 USER: Hello. I am Nicholas Nelson.

ASSISTANT: Hello, how may I help you today?

USER:  would like to participate in a mobile food distribution even which will be conducted by soldiers at Philadelphia, PA-PHL. Can you please help me with booking a return flight ticket on 06/27?

ASSISTANT: Sure, we are here to help you. Could you please provide your take off airport code?

USER: Sure, I intend to board from Charlotte, NC-CLT.

ASSISTANT: May I know when would you like to return?

USER: I have already mentioned my return date above.

ASSISTANT: Ok, may I know when you want to start your journey?

USER: Sure, I would like to start my journey on 06/25.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, we found a connected flight in Southwest airline has fare 200. Shall I proceed?

USER: Yes please proceed.

ASSISTANT: Your booking has been processed.

USER: Thank you for your kind response.

ASSISTANT: Thank you for opting us.