I'm looking for an easy web based and/or mobile tool for doing flight bookings and flight changes without having to continually enter my information, credit card information, TSA information, etc.

I used to just search on google flights, sent the itinerary to pana, and they would do all the rest of the booking. But they keep raising the prices and lowering the quality in my opinion. For example, it used to carry a monthly fee of $20/month and then went to $50 for the same level of service that it had when I signed up. And now they've told me that for the same thing it's moving to $200/month. So it's time to move on to greener pastures.

I'm hoping that an app or travel agency that uses instant messaging may fit the bill.

Recommendations?