1. What do you need?        
2. Thanks for your email on the 17^th.
3. Sorry, I can't make it.     
4. I'm sorry to tell you that...         
5. I promise... 
6. Could you...?       
7. You haven't...       
8. Don't forget...       
9. I need to...  
10. Shall I...?:   
11. But...
12. Also...        
13. So...  
14. Could you please...?       
15. Sorry for... 
16. Re...  
17. See you next week.        

 a) However, ... /Nevertheless, ...

 b) I am afraid that I will not be able to attend.

 c) I can assure you that...

 d) I look forward to meeting with you next week.

 e) I was wondering if you would be able to...

 f) I would be grateful if you could...

 g) In addition... /Furthermore, ...

 h) It is necessary for me to...

 i) It is with regret that we advise you that...

 j) Please accept our sincerest apologies for...

 k) Please let us know your requirements.

 l) Thank you for your email of the 17^th.

 m) Therefore, .../Consequently, ...

 n) We note that you have not...

 o) We would like to remind you that...

 p) With regard to... /With reference to...

 q) Would you like me to...?