You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Jeffrey Lewis. Can you please book a ticket for me as I am planning to go for business trip at Charlotte, CLT?

ASSISTANT: Sure, may I know your origin airport code?

USER: Source code is Washington, DCA.

ASSISTANT: On which dates would you like to travel?

USER: Journey dates are 04/30 to 05/02.

ASSISTANT: There is no flight on your details.

USER: No problem. Thank you.

ASSISTANT: Thank you.