You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER:  I am Catherine Baker. I have to attend my sister's wedding at Las Vegas, could you please help me with booking a flight ticket from ATL?

ASSISTANT: Sure, can you please share your preferable travel dates?

USER: I would like to take off on 05/13 and return on 05/15.

ASSISTANT: Could you please provide the destination airport code?

USER: My destination airport code is LAS.

ASSISTANT: Ok, let me check for the availability of flight on this route.

USER: Sure.

ASSISTANT: Catherine, I am sorry to inform you that there is no flight available at your requested dates.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.