So I got a call from HR last week with a very nice job offer.... but it kind of blindsided me as my manager hasn't mentioned anything so far in my internship. I like the job, and I meant to ask my manager about possible full-time in the future... but as I've only ever worked at this company, I do want to try for other jobs and explore. I have till the first week of October to decide on the job offer... but how do I thank my manager that I am really appreciative of the job offer and that I'm seriously considering it... but at the same time I'm not sure yet.
Could I just say that because it was unexpected offer, I still need a little bit to think about it? I'm going to be continuing to work here for there next few months, so I just don't want my manager to think I'm ungrateful of the offer etc... how do I appropriately respond? Thank you!