You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to attend for an interview in Denver, so please book a flight ticket from LAS to DEN.

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

USER: I want to fly on Oct 07, return on Oct 09.

ASSISTANT: Are you looking for any preferred connections?

USER: I need a single connecting flight.

ASSISTANT: Do you have any other specifications to be met?

USER: No.

ASSISTANT: Can I have your name to proceed further?

USER: My name is Mark Phillips.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: Not an issue, thank you.

ASSISTANT: Thank you for opting us.