Capitals, dashes

Hi, again I need to check my answers.

1. I received about fifty--no,it was more like sixty--calls about the accident.
should I have used the dashes or commas or what?

2. His favorite sports are football, basketball, and swimming, but mine are volleyball, baseball, and boxing.

Should I use a comma between the words "swimming, but" Or a semi colon or colon or a dash or what?

3. "I knew I could count on Aunt Mary's support,"she said. But how could I break the news to my uncle?"

Should Aunt be captalized? Also the word but should that be a small letter or a capital?

4. The general's only response was, "No commet."
Should " no" be a capital?