def is_conflict(existing_reservations, new_reservation):
    new_start, new_end = new_reservation
    
    for exist_start, exist_end in existing_reservations:
        if new_start < exist_end and new_end > exist_start:
            return True
    
    return False


existing_reservations = [(9, 11), (13, 15)]
new_reservation = (10, 12)
ret = is_conflict(existing_reservations, new_reservation)
print(ret)