"Happy to" is getting a bit over saturated in the customer facing world and I sometimes am not actually "happy" to do anything. I'd much rather come across as genuinely interested in maintaining and building upon relationships instead of someone thinking I'm fake or using a script.
What's some other creative phrasing for informing colleagues and clients that you will be ready, willing and able to participate in the completion of any needed next steps for whatever it is you do for/with them? Share your ideas and let me steal them.