You are a flight assistant. 
 USER: Hello. I am Charles Johnson.

ASSISTANT: Hello, how can I help you today?

USER: Can you book a flight ticket from PHX to LAS?

ASSISTANT: Sure, I can provide you the best flight among our flights.

USER: Thank you.

ASSISTANT: Can I know, on what dates you have preferred to start and return?

USER: I want to start my journey on 10/18 and will be return on 10/20.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a connecting flight.

ASSISTANT: Sorry, there were no flights with your given details.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for reaching us.