Here are some tips on how to accept an internship offer:

• Address the internship coordinator by name.
• Thank them for the exciting opportunity and tell them you are happy to accept their offer and look forward to working with them.
• Tell them the date you will arrive in DC and the date that you will be able to start working.
• Ask any questions you may have (dress code, transportation, etc.).
• Tell them to let you know if there is any paperwork or information they will need prior to your arrival.
• Thank them again.

Here are some tips for declining an internship offer:

• Address the internship coordinator by name.
• Thank them for considering your application and for offering you an internship with their organization.
• Tell them that you regrettably must decline their offer.