YOU SAID:
Invalid amount of tickets
INTO JAPANESE
チケットの金額が無効です。
BACK INTO ENGLISH
Amount of the ticket is not valid.
INTO JAPANESE
航空券の金額が正しくありません。
BACK INTO ENGLISH
Ticket price is not valid.
INTO JAPANESE
チケット価格は有効ではありません。
BACK INTO ENGLISH
Ticket price is not valid.
You've done this before, haven't you.