xiànzài jīngjìcāng bǐjiào mǎn, wǒ zhǐnéng bāng nín bèizhù, yě kěyǐ dēngjī hòu wèn chéngwùyuán

现在经济舱比较满，我只能帮您备注，也可以登机后问乘务员。

Currently the economy class is quite full. I can only make a note for you, or you can ask the flight attendants after boarding