I asked for an advance on salary. They said they will check with their colleagues and hopefully let me know tomorrow about whether they give it or not. However, last week I told them that today I would get back to them regarding the offer letter which is time sensitive, but I don't want to accept the offer letter before they get back to me about the advance on salary, even though I will accept the offer whether they give the advance on salary or not.
How can I tell them that I will respond to the offer letter when I hear back from them about the advance on salary?