Hi, Melissa

I'm so sorry for the bad call quality today. Before the call I thought if I put on my earphone, I could hear your voice louder. But it sounded smaller, I took off it ;)
Tomorrow I'm going to the trip with my family and I'll come back on Wednesday night. So I postpone that class ;)
Have a great week and see you on Friday.

CORRECTION: 

I'm so sorry for the bad call quality today. Before the call I thought of putting on my earphones so I could hear your voice louder. But it sounded smaller thus I took them off. ;)
Tomorrow I'm going on a trip with my family, and I'll come back on Wednesday night. So, I postpone that class ;)
Have a great week and see you on Friday.

>Good day,

I think it  would be better without earphones, but no worries I could still hear your voice, 

Hope you will have a great vacation, 

Thank you.