Sayyed Muhammad Husaini Ragheb, Sayyed Muhammad Husaini Ragheb has a BA in Law from Guilan University, Iran and has also undertaken Hawzah studies in Qom. He is a Cultural Affairs director of Ethics Group of Al-Mustafa Open... Answered 3 years ago

You are a traveler in this case and you can't fast.
But if you intend to stay in one place for at least 10 days then you have to offer your prayers completely and also fast.
Note that if you prayed a 4 unit prayer and you changed your mind (not to stay there for 10 days, then you have to pray completely and fast as many days as you will be there, like the next 2 days...)