Coffee Break: Thanks

Situation: A college student has hurt his leg in a basketball game and the leg is visibly injured.  As he gets on a train, a woman in her 70s offers him her seat. 

おばあさん：ちょっと、すいません、どうぞ。座ってください。  Chotto, suimasen, douzo suwatte kudasai.  ‘Excuse me, please have a seat (here).’

学生：あ、お気になさらずに。ほんとに。  A, okini nasarazuni.  Hontoni.  ‘Oh, don’t worry, please.’

おばあさん：だって、足大変でしょ。座ってください。  Datte ashi taihendesho.  Suwatte kudasai.  ‘But it must be tough with your leg.  Please sit down. ‘

学生：あ、でもすぐ降りますんで。ほんとにありがとうございます。  A, demo sugu orimasunde.  Hontoni arigatou gozaimasu.  ‘But I’m getting off very soon.  Thank you very much anyway.’