You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Karen Garcia. I want to book a ticket from PHX to DEN, Can you help me to make a reservation?

ASSISTANT: Sure, when you are willing to travel?

USER: My travelling dates are on Sept 13 and Sept 15.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 300 is provided by Southwest airlines. Shall I proceed with this?

USER: You can confirm it.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Flight number:1008. Thank you for reaching us.