I booked Paris to Interlaken sbb tickets for two clients but I typed wrong birthday.
Order no.: XXX (Basel-Interlaken)
**REFERENCE NUMBER: XX (Paris-Basel)
Customer reference number: 0029090162281210383
No. e-ticket: 296541871
Their birthdays are switched each other.
Therefore, what should I do? Can I get a refund of these tickets if I book same tickets with correct birthday?