I have applied to 2 postdoc jobs in the same university and have been selected for a 2nd interview in one before doing the first interview in the other lab.
The interviews are set at different times and so I will not be able to attend both so I wish to cancel the one where I haven't been yet. Should I say to the professor the truth "I will be interviewing with another lab" or shall I just say that for some reason I have to cancel it without mentioning the other interview?