I want to buy two return tickets from Geneva Airport to Zermatt. I can enter the date I want to travel from Geneva to Zermatt on the first screen, but I can’t find where to enter dates for the return journey. If i then choose which single journey i want and then i select ‘ single and return journey ’ as the travel option on the next screen it says ‘ To find a suitable offer, please select a later return date ’ and the ‘ choose return journey ’ is disabled. I’m going round in circles! Do I just have to buy two separate single journeys? Many thanks!