You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I aid you?

USER: As I need to travel Phoenix, please book a ticket from Las Vegas, NV-LAS to AZ-PHX.

ASSISTANT: Sure, I can help you. Can I know your travelling dates?

USER: Departure date is 01/24 and 01/26 is my return date.

ASSISTANT: Do you need any connection?

USER: Yes, please provide connecting flight.

ASSISTANT: May I know your name?

USER: I'm Richard Thomas.

ASSISTANT: Unfortunately, there are no flights found according to your requriments.

USER: Thanks for the help.