A call make a bit too late

Oh dear, I thought of giving her a call to wish her a safe and entertaining business trip to Bali but....but....I guess I call a bit too late. Should have take the initiative and ask her the flight time. Called 3 times and each time its the same message, "The M1 customer that you are calling is currently unavailable". AHHHH!!!!....Where is the voice mail??? Sigh.