There are plenty of ways but I would go with this:
¿Cuál es su número telefónico de la oficina ?
I love guacamole its a Spanish chip dip and since Guatemala is a Spanish country it works. Now in Spanish countries guacamole does not have all the stuff we Americans put into it for instance I put avocado, tomato, onion, garlic salt and a little bit of lime or lemon juice. In south America they only use avocado. when I was a kid I hated guacamole but that's probably because I had the traditional kind.
How that or do you need more
Grains sweets proteins sorry that's all I have.
