I have called on you to ask for your cooperation in the investigation.

They had "taken control of the situation in Bangkok" and politely asked for the public's cooperation.

She visits an old friend to ask for his cooperation, but her offer is refused.

"Sir, I'm going to ask one more time for your cooperation."

Why didn't they contact us and ask for our cooperation?

If the man would just come out and explain the situation to me, ask me for my cooperation.

I have sent him a letter, asking for his cooperation.

I would like to ask for your committed cooperation in this regard.

I would, therefore, ask for your cooperation, although I do understand current difficulties.

I would like to ask all of you for your cooperation.