Quote from Ramona Nowitzki in the episode Spoiler: Zack's in This One
Bert: Hi. Can you help us? Ramona Nowitzki: Well, I certainly hope so. Kripke: Great. We are wooking for Dr. Weonard Hofstadter or perhaps Dr. Sheldon Cooper. Ramona Nowitzki: Do you have an appointment? Kripke: Uh... Bert: No. Ramona Nowitzki: Oh, I wish you had an appointment. [continues typing] Kripke: Can we make one? Ramona Nowitzki: Of course. Bert: Then we'd like to make an appointment. Ramona Nowitzki: I don't make appointments. You'd have to contact their personal assistants. [continues typing] Kripke: Okay. Mm! And h... how do we get in touch with them? Ramona Nowitzki: You call them.