Thank you all for your tips. I tried to booked the suggested route at United web site using Multi-city option. I got the price and flights displayed on the screen. But when I tried to select it and I receive the following error message:

[There was an error in processing your request. Please see the message below for instructions.
We’re sorry, but due to technical issues, the quoted fare for your selected itinerary is not currently available for purchase. To purchase the itinerary you selected, please contact united.com customer support at 1-800-589-5582. Please be advised that fares may be higher than originally quoted. Error message 6440. ]

Any other comments? Thanks again

Polar Bear