You are a flight assistant. 
 USER: Hi, I am Catherine Mitchell.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a flight ticket to Phoenix on 07/15 to attend my uncle's house warming ceremony and I intend to return on 05/17, can you help me with this?

ASSISTANT: Sure, please provide me your airport codes.

USER: I will start from Las Vegas, NV-LAS to Phoenix,AZ-PHX.

ASSISTANT: Do you need any stop over in between your journey?

USER: I need a stop over.

ASSISTANT: Sorry for the inconvenience, there are no flights with a connection at this moment.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for choosing us.