Hi Martina, I'm afraid that this is not exactly the best place to get the kind of immediate help that you may be looking for. This forum is for hosts who offer some input/advice/support to other hosts. It seems as though you might benefit from contacting customer support directly. There is no Airbnb customer support function to this community. Go to the HELP section of your dashboard and look for the "contact us" info.
Of course if you want to expand on what you need help with in this community, I'm sure that some experienced hosts will be happy to offer you some support - but reservation specific help has to be done through customer support.
Take a look at this thread, it's similar to your question:
https://community.airbnb.com/t5/General-Hosting/impossible-to-contact-airbnb-Help/m-p/6852#U6852