Dear <name of contact person>
Please refer to your ‘advertisement’/‘letter’/‘phone call’ of <date> in <publication> with respect to <position>.
In your ‘advertisement’/‘letter’/‘phone call’ ‘it is’/‘you’ mentioned several aspects that interest me. However, it also raised some questions for me. In this respect I would greatly appreciate some more information regarding the following questions:
[li]What are the current salary scales for this position?
[/li]> [li]With respect to the expenses incurred, are these covered by a per diem allowance or directly charged to <name of company>?
[/li]> [li]Do these expenses cover meals and accomodation?
Many thanks in advance for your time and timely response. Should you have any questions, please do not hesitate to contact me.
The above is just a quick example. The introduction may be more elaborate, depending on the circumstances and the position you are inquiring about.