I really don't like Skype, but you don't have choice in these kind of situations, when all use it so you have to as well.

Some notes for me (not to Google every time) to enable/disable wiki markup in the conversation.

/wikimarkup [on/off]

All the supported syntax is below. Thanks to this post.

• bold - *bold*
• italic - _italic_
• strikethrough - ~strikethrough~
• inline code - {code}inline code{code}, ```inline code```
• monospace - !! monospace
• monospace with emoticons - @@ monospace with emoticons