Expressing doubt. Learn and practise dialogue

example:
a: Indonesian U-19 National Football Team played very bad in AFC CUP 2014. I think Coach Indra's strategy was terrific.
b: I dont think so dude, IMHO they just got tired cause by all exhibition match they contended.
a: But they got over from AFC CUP 2014. and they failed to go to FIFA WC U-19 2015
b: Yes,but not at all. We still have more dream, may be next time.