Sorry I missed your call. I wasn´t able to talk I was in the office.

 Telefon görüsmesin kactığımı üzgünüm. Konuşamadım çunku işteydım (or bürodaydım). 

My attempt but very dubious!!! - Sonunda where are you???

I think it´s Marion you need!   

 MARION!!!!!  Little help here please

thanks for your help. It may not be perfect but it is better than my own attempt and I´m sure it will be understood.

Thanks again