Jim Halpert (John Krasinski) is a paper salesman at the Scranton branch of Dunder Mifflin. He is a good guy, and very intelligent albeit unmotivated. Throughout the four seasons of the show and counting, Jim spends most of his time pining for Pam Beesly and/or engineering pranks at the expense of office-mate Dwight Schrute.
Jim: I don't have a ton of contact with the Scranton branch, but before I left, I took a box of Dwight's stationery, so from time to time I send Dwight faxes. From himself. From the future: "Dwight, at 8am today, someone poisons the coffee. Do not drink the coffee. More instructions will follow. Cordially, Future Dwight."
Dwight: Ding dong.
Jim: Who is it?
Jim: Alright. I just got out of the shower, I'll be one second.
Dwight: [in accent] When you are done, open the door. ... Hello in there?
Jim: Yeah, I'm late for work, so I have to brush my teeth, it's a whole routine.
Dwight: We have more houses to visit.
Jim: If you want to come back then, that'll be fine.
Dwight: We will come back at... how is [looks at watch] 4:45?
Jim: I get back from work around 6.
Dwight: How about 5:15?
Jim: You can try. That, that might work.
Dwight: Very well, we will come back at 5:15.