I would like to thank you for the company's support during the trip.

Mrs. Park: Why certainly, but we still need to make a decision about the agreement you negotiated while you were there.

위의 예문에서 why certainly를 좀 자세히 설명해주실 분 계신지요?  네이버에 검색해 보니 책제목만 눈에 띄고 설명은 없고 ㅜㅜ (Why Certainly! Paddy Jack Down the Track) 

구글에서도 찾아볼 수가 없네요...