You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you at this moment?

USER: I want to attend a Marriage in Las Vegas. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am here to help you with this. Can you please provide your journey dates?

USER: My travelling dates are 04/04 and 04/06.

ASSISTANT: May I know your airport codes of journey please?

USER: My airport codes are PHX and LAS.

ASSISTANT: Do you have any connection limit preference?

USER: I need single connecting flight.

ASSISTANT: Do you have any other specifications for this trip?

USER: No, I don't have any other specifications.

ASSISTANT: May I know your good name please?

USER: My name is Alexander Garcia.

ASSISTANT: Alexander Garcia, we regret to inform you that there are no flight services are available on this route with your preferences.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for contacting us.