You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Can you please help me to book a ticket from PHX to LAS?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: My travelling dates will be on July 1 to July 3.

ASSISTANT: Ok, do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Ok.

ASSISTANT: May I know your name please?

USER: Elizabeth Lee here.

ASSISTANT: Sorry Elizabeth Lee, there are no flights available on your requested dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.