You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Melissa Collins. I am planning to go for Center for puppetry arts at Atlanta, ATL. Can you please book a ticket on 07/30?

ASSISTANT: Sure, could you please help me with your source code?

USER: Source code is Charlotte, CLT.

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

USER: I will return back on 08/01.

ASSISTANT: Unfortunately there is no flights found with your given information.

USER: No problem.

ASSISTANT: Thank you for opting us.

USER: Thank you.