Can I book a taxi today, please? I'm going to Avalon.
I would be happy to help you. First I will need to know where you are departing from and what time you want to arrive/depart.
Pick me up at the pizza express Fen Ditton and take me to the avalon before 21:00.  Can I get the car type and contact number?
A red lexus will pick you up by 21:00. Your contact number is 07323820078.
I need to be at the avalon by 21:00. The taxi will have to arrive slightly earlier to get me to my destination on time.
Oh, I am very sorry for my error.  You will arrive at Avalon by 21:00.  I reserved a blue lexus with new contact # 07060980339.  
Thank you so much for your help.
Let me know if there is anything else you need.