Please give your credit card number to Ichiro Takahashi, the reservations clerk, to confirm your booking.
Literal
Reservations-clerk-[apposition-の] Takahashi Ichiro-Mr. [to-に], reservation-confirmation for-[purpose-ため] your credit-card number [object-を] contact-[polite-てください].
A formal written instruction. Note the appositive use of の: 予約係の高橋一郎氏 — literally 'Mr. Ichiro Takahashi of [the capacity of] reservations clerk,' a pattern common in business Japanese for specifying someone's role alongside their name. 氏 (shi) is a formal suffix like 'Mr./Ms.' used in written contexts, more official than さん. ~ため is the purpose construction — 'for the sake of X.'