Just finished downloading my copy of Don't Rest Your Head 

Many thanks Iago

These are all from Summer Knight. I've edited them to leave just the dialogue.

For either Presence or Rapport (making a good first impression). Both are from chapter 4:

Harry: 'Hey, I'm supposed to wear a robe. we all are.'
Ebenezar: 'Somehow I don't think a plaid flannel bath robe is what they had in mind.'

Also for Presence or Rapport:

Harry: 'My cat used my good robe as a litter box.'

And for Scholarship (languages) from chapter 5:

Harry: 'What?'
Ebenezar: 'Well. First you said, "I am a sorry excuse, Merlin, a sad long day held me. I need me a different laundress.'
Harry: 'What?'
Ebenezar: 'That's what the Merlin said. Then you said "Excuses to you for my being dressed and I also make lately."'
Harry: 'Goddamned correspondence course. Maybe you should translate for me.'
Ebenezar: 'Happy to.'

This could easily be edited down a little more and still give a pretty good impression of Harry's scholarly skills.