Hi, I seriously need someone to fix my A/C.  This is infuriating.
At what hotel are you currently staying?
I'm in the Hyatt.  Last time I stay here.  You pay good money and the AC doesn't work.
Could you provide your room number, please?
I'm in 450. 
Could I get your name, please?
I'm Mark.  Please make my appointment for 4 pm.
I am sorry to inform you that your request could not be processed at this time.
What's the next available service time?  5 pm?
Your request has been submitted successfully.
A member of the service team will knock on the door of room 450 at 5 pm!
Good.  I'll be in the pool until then.
Thank you and goodbye.