How to say NO without saying NO.
  →'NO'라고 말하지않고 'NO'라고 표현하는방법 (전화에티켓)

                〔예문〕
Greg:   This is Greg Waits; Could you put me though to Gina Sand?
             그레그웨잇이라고 합니다.지나샌드씨를 연결해주십시요.

Adam : I'm afraid she isn't available at the moment. 
              지금 바쁘신것같습니다.

           Would you like me to have her call you back?
             전화를 드리라고 전해드릴까요?

Greg:  That'd be fine. Do you know about when?
             괜찮습니다.언제쯤 통화가 가능할까요?

Adam: I'm sorry.I'm not sure.
           죄송합니다만정확히 모르겠습니다.

            But I'll be sure to let her know you called.
            전화하셨다고 지나씨에게 틀림없이 전해드리겠습니다.