Dear Dr. XYZ,
amwas very glad to readreceive your email, and it will be my pleasure to receive a call from you at your convenience. A good time for me would be tomorrow (Monday 01.02.2010) [for clarity write 1st Feb]]. at 11:00 a.m. At this time you can reach me by phone on my mobile - number is alsoyyyyyyyyyyyyy.
If this time is not suitable for you, please let me know by email what day and time would be best for you.
Thank you in advance