You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Steven Collins.

ASSISTANT: How can I assist you?

USER: I will be attending my niece birthday in Atlanta, can you book a flight to ATL?

ASSISTANT: Sure Collins, I will help for booking. May I know your source code?

USER: My source code is ATL.

ASSISTANT: Ok, can you please provide me your travelling dates?

USER: My travel dates are from 08/24 to 08/26.

ASSISTANT: Sorry for inconvenience, there is no flight available for your required dates.

USER: No issues, that's ok. Thank you for checking.

ASSISTANT: You are welcome. Thank you for choosing us.