You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am planning to visit Las Vegas, can you please book me a ticket from PHX to LAS?

ASSISTANT: Sure, can you please share your travel dates?

USER: My preferable journey dates are from 10/28 to 10/30.

ASSISTANT: May I know your name to proceed further?

USER: My name is Benjamin Green.

ASSISTANT: Thank you for the details. Benjamin, there is no flight available at your requested dates.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: Thank you for contacting us.