You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I'm Emma Hernandez. I am planning to attend convocation meeting at Charlotte, can you please help me with booking a flight ticket?

ASSISTANT: Sure, may I know your airport codes please?

USER: My source airport code is LGA and the destination airport code is CLT.

ASSISTANT: Could you please share your preferred journey dates?

USER: Sure, I would like to take off on 04/13 and return back on 04/15.

ASSISTANT: Emma, there are no flights available at this moment.

USER: Ok, no issues. I will try another way to complete my trip. Anyways, thank you for checking.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: You are welcome.