Task-oriented dialogue about: taxi

Please book a taxi for me
Sure! when would you like to arrive?
I want to arrive by 19:00
I can definitely help! Where are you departing from?
I am leaving from the Alpha-Milton Guest House.
Where will the taxi be taking you tonight?
I am eager to visit cambridge university botanic gardens.
Ok, I've booked your taxi. It will be a grey lexus, contact number 07229148300
What time will the taxi be arriving at the Alpha-Milton?
You should contact the taxi for an approximate time.
That is all I need. Goodbye.
Anytime! Enjoy your stay.