Use “too” to reciprocate a greeting
A: "Have a great day!"
B: "You too!"
Use “Excuse me” to introduce a question
A: "Excuse me, can you tell me where the bus stop is?"
Say “Thanks” to acknowledge requested information
A: "The bus stop is two blocks down the street."
B: "Thanks!"
Say “Excuse me?” if you don’t understand
A: "The store closes at six."
B: "Excuse me? Could you say that again?"