If the answer is "yes", but you don't know the language, don't worry!

First of all, you must know the greetings:

Hello = Hola
Good Bye = Adiós
Good morning = Buenos días
Good afternoon = Buenas tardes
Good evening = Buenas tardes/noches
Good night = Buenas noches
See you soon = Hasta pronto
See you later = Hasta luego/Nos vemos más tarde
See you = Nos vemos

and basic words or questions:

Thank you = Gracias
Thank you very much = Muchas gracias
What's your name? = ¿Cómo te llamas?
How old are you? = ¿Cuántos años tienes?
Where are you from? = ¿De dónde eres?
How are you? = ¿Qué tal estás?/¿Cómo estás?

It's a nice way to start