请帮将下面的中文句子写成英文,谢谢

1. Could you be sure today that we could apply for the visa to Serbia in London?(the purchase of air tickets are depending on this information)
2. Please tell me what we should provide to get the visa to Serbia.
3. Passport Scanning is attached hereby.
再问： 你好，谢谢你，如果我想说“请问我们可以在伦敦办理塞尔维亚的签证吗？（因为现在要确定机票，需要知道我们是否去塞尔维亚）”该怎么写呢？
再答： we could apply for the visa to Serbia in London?(I need to know whether we should go to Serbia right away cos the purchase of air tickets are depending on this information)