1 line change to website form

When a customer fills out a form on my website and I receive their details by email, the 'from' column in my email inbox shows the customer's email address instead of their name, which is what I'd prefer. So need a developer to change code to list name instead of email address. I assume this should be a very easy and quick project. Also, this is an vacation apartment rental website and the form includes a calendar on it - would like following changes to it: 1) when customer highlights an arrival date, the departure date automatically goes to following day - would like to leave this departure day off so they can choose 2) when customer moves the calendar to show a later month, it moves 1 month at a time - would like to change to 2 months at a time (since the calendar always shows 2 months at a time).