You are a flight assistant. 
 USER: Hello, Dennis Young here.

ASSISTANT: Hello, how may I guide you?

USER: I am planning to visit Denver, can you please book me a ticket from SFO to DEN?

ASSISTANT: Dennis, I am here to help you. When you are willing to travel?

USER: My preferable journey dates are from 06/21 to 06/23.

ASSISTANT: Just a moment.

USER: Sure, I will wait for your response.

ASSISTANT: There is a flight with UA airlines and the ticket figure is 300. Shall I proceed for this?

USER: Please book my ticket with this airlines.

ASSISTANT: Your ticket is reserved in business class with the flight-1006.

USER: Thank you for your help.

ASSISTANT: Thank you Dennis for approaching our agency.