You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Charles Jones here. I would like to book a flight ticket from PHX, can you please reserve my flight ticket to HOU?

ASSISTANT: Sure, can you share your trip dates?

USER: My trip dates are Nov 25th and Nov 27th.

ASSISTANT: Do you have any preferences?

USER: I prefer to travel in business class.

ASSISTANT: May I know your name?

USER: I already mentioned above.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.