Dear Ayşe,
I hope you are well. Everything is fine with me in terms of your favour. I am writing 
this
 letter to thank you sincerely.
As you know Linking Words
last
 month while I was taking a vacation the unplanned sales summit took place. It was my task to prepare whole sales presentations and deliver them to the manager,Linking Words
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however
 I was in the USA and had no chance to work remotely. Mehmet give me a call and told me that you made everything up for me.Add a comma
,however
This
 help might be really saved my current job. As Mehmet said it was an excellent issue and my manager was satisfied. Now I owe you a lot because you spent a lot of time and maybe overworked.
As I remember Linking Words
next
 week will be held the marketing meeting. I would be glad if I will do all work on behalf of you. It could be a good opportunity to convey my pleasure. Please keep me posted. 
Best regards
MertLinking Words