Why hadn't she asked him to postpone his trip a few days?

The best advice I can give you is postpone your trip, if possible.

But at the last moment, the cardinal postponed his trip.

"I forgot to tell you that she postponed her trip to Florida today."

If the answer to most of these questions is 'no', you might consider postponing your trip to a more appropriate time.

I thought to postpone my trip because of the difficulties we are facing.

He would be willing, however, to postpone his trip, if some other errand should present itself.

I think you should postpone your trip until you become more responsible with money.

Zimbabwe's foreign minister said that they had asked the Elders to postpone their trip.

I wanted once more to postpone my trip abroad.