"Thank you, and have a nice weekend."
Translation:Děkuji a hezký víkend.
It's pronounced like the "ye" in "yesterday."
*Note: When "ě" follows the letter "m", it is pronounced as if there was a letter "n" between them. For example, the word "měkký" means "soft" and is pronounced "mněkký."
Well, not only that. In this very case "děkuji" is pronounced as [ď e k u j i], so the is palatalized and the "e" is quite the ordinary [e].
See the Tips and notes or the Wikepedia article about Czech phonology.