✔ 最佳答案
Hi, I am the new joiner, Mr. B has already resigned, if you need anything or have any problems, other colleagues or I will be there to assist/help you.
OR
Hi, I am the new joiner, Mr. B has already resigned. Other colleagues or myself would be your helping hands if you need anything.
OR
Hi, I am the new joiner, Mr. B has already resigned. Is there anything that other colleagues or I can be of help.
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Sorry to give u diff version, cos I am not sure when you will say the above. If you are telling s'one that you and others will be helping out, the first one and the second one both will do. But if you are asking whether there is anything that you and others can offer help, use the last one.