You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Catherine Collins.

ASSISTANT: How may I provide assistance to you?

USER: Please book a flight ticket from Las Vegas, LAS to Denver, DEN.

ASSISTANT: When you are planning to make your journey?

USER: My planned dates are from 07/07 to 07/09.

ASSISTANT: Do you want to fly with economic class or business class?

USER: I am flexible to travel with any class.

ASSISTANT: Please give me a moment, I will check the details of flight and let you know.

USER: Sure.

ASSISTANT: There is a flight available with price 300 and flight number is 1011 which matches your given information. Can I confirm your booking?

USER: Ok, You can proceed with booking.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for approaching us.