英语写给朋友的信

Dear XXX,
I just happen to be on a business trip and I am not able to meet you at the airport.I'm really sorry about that.When you arrive the airport,you can take the airport bus to XXX Street,then taking Bus 21 from the bus stop to XXX Street.Getting off the bus there,You will see a high building with big red roof.My home is 301 on 3rd floor.Otherwise,you can take a taxi from the airport and tell the driver my address,which is 301,XXX Building,XXX Street.You will be warmly welcomed to my home.Looking forward to your coming.
Best wishes
Yours sincerely
XXX